A linkage yarn feeder

Abstract

The application discloses a linkage type yarn feeder, which comprises a transmission shaft, a first transmission wheel, a second transmission wheel, a switcher, a presser wheel, a winding drum, a linkage shaft and a first reset spring. The first transmission wheel, the switcher, the second transmission wheel, the presser wheel and the winding drum are sequentially arranged along the transmission shaft from top to bottom. The linkage shaft is movably sleeved in the transmission shaft. The upper end of the linkage shaft is in sliding fit with the transmission shaft and is fixedly connected with the switcher. The lower end of the linkage shaft is in sliding fit with the transmission shaft and is fixedly connected with the winding drum. The first reset spring is sleeved on the outer periphery of the transmission shaft and is located between the switcher and the second transmission wheel. The second transmission wheel is a one-way wheel. The linkage type yarn feeder has the advantages of high applicability, low cost, small size, energy saving, flexible mode switching and the like.

Description

Technical Field

[0001] This invention relates to the field of knitting machinery and equipment technology, and in particular to a linked yarn feeder. Background Technology

[0002] The yarn feeder is a crucial component of a circular knitting machine. It mainly consists of a housing, a main shaft mounted on it, and a yarn feed wheel. A pressure ring and a tension disc are fitted onto the yarn feed wheel. The main shaft is located at the center of the yarn feed wheel and drives its rotation to store yarn. Yarn storage involves feeding yarn into and storing it on the yarn feed wheel, while yarn feeding involves outputting the yarn from the yarn feed wheel via the tension disc. In the production of high-quality weft-knitted fabrics, a yarn feeder is needed to control the size of the knitting loops and stabilize the yarn tension during knitting. Currently, there are two main types of yarn feeders available: one is a regular yarn feeder, also called an active yarn feeder or a fixed-length yarn feeder. This type does not require an active motor but uses the belt on the knitting machine as its power source, offering energy savings. However, because it can only feed a fixed quantity of yarn, it is not suitable for jacquard weaving processes. Another type is the electronic yarn accumulator, also known as the non-fixed-length yarn feeder, which is suitable for irregular yarn feeding. It has a motor installed inside the yarn accumulator. The yarn detection system inside the yarn accumulator determines whether to start the motor to drive the yarn accumulator wheel to perform a yarn replenishment action based on the detected yarn status. Although it can meet the needs of irregular yarn feeding and is suitable for jacquard processes, each yarn accumulator needs to be equipped with an independent motor, which not only increases its size but also increases its cost and energy consumption.

[0003] In existing technologies, to enable production machines to simultaneously perform regular and irregular yarn feeding functions, two yarn feeding systems are typically set up. One yarn feeding system uses regular yarn feeding devices for all its yarn feeders, while the other yarn feeding system uses irregular yarn feeding electronic yarn feeders for all its yarn feeders. Since all the conveyors in each yarn feeding system are arranged in a circular array, the overall volume of the existing conveying system is limited by the electronic yarn feeders, resulting in poor applicability and room for improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a linkage yarn feeder that can at least solve one of the above-mentioned problems.

[0005] According to one aspect of the present invention, a linkage-type yarn feeder is provided, comprising a drive shaft, a first drive wheel, a second drive wheel, a switcher, a yarn pressing wheel, a yarn winding cylinder, a linkage shaft, and a first return spring. The first drive wheel, the switcher, the second drive wheel, the yarn pressing wheel, and the yarn winding cylinder are arranged sequentially from top to bottom along the drive shaft. The linkage shaft is movably fitted inside the drive shaft. The upper end of the linkage shaft is slidably engaged with the drive shaft and fixedly connected to the switcher, and the lower end is slidably engaged with the drive shaft and fixedly connected to the yarn winding cylinder. The first return spring is fitted around the outer periphery of the drive shaft and is located between the switcher and the second drive wheel. A one-way bearing is fitted inside the second drive wheel, and the second drive wheel is fitted around the outer periphery of the drive shaft through the one-way bearing.

[0006] In non-fixed-length yarn feeding operation, the speed of the first drive wheel is greater than that of the second drive wheel, and the switch is engaged with the first drive wheel. The yarn is introduced and wound around the yarn bobbin several times before being pulled out. The first drive wheel drives the drive shaft to rotate, and the yarn bobbin rotates synchronously with the drive shaft to wind the yarn, with the yarn introduction speed being higher than the extraction speed. The amount of yarn on the yarn bobbin gradually increases. When the amount of yarn wound on the yarn bobbin increases to a certain level, the yarn bobbin moves downward relative to the drive shaft. The downward movement of the yarn bobbin drives the linkage shaft to move downward, and the linkage shaft drives the switch to move downward and disengage from the first drive wheel. At the same time, the switch compresses the first return spring. At this time, the drive shaft is driven to rotate through the second drive wheel, and the yarn bobbin rotates synchronously with the drive shaft, but the speed decreases. When the loom continuously uses yarn and the amount of yarn wound on the yarn bobbin decreases to a certain level, the switch is reset under the action of the first return spring, which drives the linkage shaft to reset. The linkage shaft drives the yarn bobbin to reset, and the yarn bobbin rotates synchronously with the drive shaft to wind the yarn. This cycle continues.

[0007] During fixed-length yarn feeding, the switch is engaged with the first or second drive wheel to ensure that the lead-in speed and lead-out speed are consistent, the amount of yarn on the yarn bobbin remains constant, the yarn bobbin does not produce axial displacement, and the linkage shaft does not produce axial displacement.

[0008] In some embodiments, the linkage yarn feeder further includes a first connecting piece, which is mounted on the upper end of the linkage shaft and fixedly connected to the switch at both ends. The drive shaft has a first sliding groove that slides with the first connecting piece, and the first sliding groove extends along the length of the drive shaft.

[0009] In some embodiments, the linkage yarn feeder further includes a second connecting piece, which is installed at the lower end of the linkage shaft and fixedly connected to the yarn winding bobbin at both ends. The drive shaft has a second sliding groove that slides with the second connecting piece, and the second sliding groove extends along the length of the drive shaft.

[0010] In some embodiments, the end of the first drive wheel near the second drive wheel is provided with a first limiting groove that cooperates with the switch limiting, and the end of the second drive wheel near the first drive wheel is provided with a second limiting groove that cooperates with the switch limiting.

[0011] In some embodiments, a third limiting groove is provided at the end of the switch near the second drive wheel, and the first reset spring is fitted into the third limiting groove.

[0012] In some embodiments, the linked yarn feeder further includes a yarn quantity adjustment mechanism. This mechanism includes an adjustment knob mounted on the drive shaft and located at the bottom of the yarn bobbin, and a second return spring mounted inside the yarn bobbin and cooperating with the adjustment knob. The adjustment knob is threaded into the drive shaft. Thus, the compression of the second return spring can be adjusted by adjusting the knob, thereby adjusting the magnitude of the thrust generated by the second return spring on the yarn bobbin. The direction of this thrust is opposite to the direction of the yarn bobbin's downward movement. The more the second return spring is compressed, the greater the thrust, and the more yarn is required for the yarn bobbin to move downward; conversely, the less the second return spring is compressed, the smaller the thrust, and the less yarn is required for the yarn bobbin to move downward.

[0013] In some embodiments, the bottom of the yarn bobbin is provided with a fourth limiting groove that cooperates with the second return spring.

[0014] In some embodiments, the linked yarn feeder further includes a first mounting frame, which is mounted on the loom. A drive shaft passes through the first mounting frame, and a pressure roller is mounted on the first mounting frame. A first drive wheel, a second drive wheel, and a switch are located above the first mounting frame, while the pressure roller and the yarn winding cylinder are located below the first mounting frame.

[0015] In some embodiments, the linked yarn feeder also includes a yarn introduction mechanism for introducing yarn into the yarn winding bobbin;

[0016] The yarn introduction mechanism includes a second mounting frame mounted on the first mounting frame, and a first yarn guide hole, a yarn tensioner, a yarn selector, a second yarn guide hole, and a third yarn guide hole mounted on the second mounting frame. The yarn selector is provided with multiple fourth yarn guide holes. The yarn is introduced into the yarn winding bobbin by passing through the first yarn guide hole, the yarn tensioner, the fourth yarn guide hole of the yarn selector, the second yarn guide hole, and the third yarn guide hole in sequence.

[0017] In some embodiments, the linked yarn feeder also includes a yarn lead-out mechanism for leading the yarn from the yarn bobbin to the loom;

[0018] The yarn lead-out mechanism includes a third mounting frame mounted on the first mounting frame and a fifth yarn guide hole mounted on the third mounting frame. The yarn is led out to the loom through the fifth yarn guide hole.

[0019] The beneficial effects of this invention are:

[0020] 1. The linkage yarn feeder of the present invention can realize both fixed-length yarn feeding and non-fixed-length yarn feeding, and has strong applicability;

[0021] 2. The power source of this yarn feeder is the transmission on the loom, which is a centralized transmission. The loom generally operates 24 hours a day without stopping. The yarn feeder can be driven by the inertia of the loom, without the need for additional drive, thus saving energy.

[0022] 3. Both fixed-length and non-fixed-length yarn feeding are completed in the same yarn feeder. The two modes can be switched by simply adjusting the speed of the transmission belt and operating the switcher. The switching method is flexible.

[0023] 4. The non-fixed length yarn feeding is completed by using a linkage structure, which eliminates the need for motors or other driving components. The non-fixed length yarn feeding can be completed through its own mechanical structure, resulting in low cost and a significant reduction in overall size and space occupation. It can also be assembled into a larger loom.

[0024] In summary, the linkage yarn feeder of the present invention has many advantages such as strong applicability, low cost, small size, energy saving, and flexible mode switching. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the present invention after omitting the yarn introduction mechanism and the yarn exit mechanism;

[0027] Figure 3 for Figure 2 A top view schematic diagram of the linkage yarn feeder shown;

[0028] Figure 4 for Figure 3 A schematic cross-sectional view of the linkage yarn feeder along the AA direction;

[0029] Figure 5 This is a three-dimensional structural diagram of the transmission shaft of the present invention;

[0030] Figure 6 This is a cross-sectional view of the present invention with some structural elements omitted.

[0031] Figures 1-6Reference numerals in the attached drawings: 1-Drive shaft; 2-First drive wheel; 3-Second drive wheel; 4-Switcher; 5-Pressure wheel; 6-Yarn bobbin; 7-Linkage shaft; 8-First return spring; 9-First connecting piece; 10-Second connecting piece; 20-Yarn quantity adjustment mechanism; 30-Yarn introduction mechanism; 40-Yarn exit mechanism; 50-First mounting bracket; 60-First assembly; 70-Second assembly; 80-Dust cover; 11-First slide groove; 12-Second slide groove 21-First limiting groove; 31-Second limiting groove; 32-One-way bearing; 41-Third limiting groove; 61-Fourth limiting groove; 201-Adjusting knob; 202-Second return spring; 301-Second mounting bracket; 302-First yarn guide hole; 303-Yarn tensioner; 304-Yarn selector; 305-Second yarn guide hole; 306-Third yarn guide hole; 401-Third mounting bracket; 402-Fifth yarn guide hole; 304a-Fourth yarn guide hole. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] Figures 1-6 A linkage yarn feeder according to one embodiment of the present invention is shown schematically.

[0034] like Figures 1-6 As shown, the linkage yarn feeder includes a drive shaft 1, a first drive wheel 2, a second drive wheel 3, a switcher 4, a pressure wheel 5, a winding bobbin 6, a linkage shaft 7, and a first return spring 8. The first drive wheel 2, the switcher 4, the second drive wheel 3, the pressure wheel 5, and the winding bobbin 6 are arranged sequentially from top to bottom along the drive shaft 1. The linkage shaft 7 is movably fitted inside the drive shaft 1. The upper end of the linkage shaft 7 is slidably engaged with the drive shaft 1 and fixedly connected to the switcher 4, and the lower end is slidably engaged with the drive shaft 1 and fixedly connected to the winding bobbin 6. The first return spring 8 is fitted around the outer periphery of the drive shaft 1 and is located between the switcher 4 and the second drive wheel 3. A one-way bearing 32 is fitted inside the second drive wheel 3, and the second drive wheel 3 is fitted around the outer periphery of the drive shaft through the one-way bearing 32.

[0035] The linkage yarn feeder of this embodiment also includes a first connecting piece 9. The first connecting piece 9 is installed on the upper end of the linkage shaft 7 and its two ends are fixedly connected to the switcher 4 by screws, pins, or welding. The drive shaft 1 has a first sliding groove 11 that slides with the first connecting piece 9. The first sliding groove 11 extends along the length direction of the drive shaft 1. The first connecting piece 9 allows the switcher 4 to move along the length direction of the drive shaft 1 and rotate with the drive shaft 1.

[0036] The linkage-type yarn feeder of this embodiment also includes a second connecting piece 10. The second connecting piece 10 is installed at the lower end of the linkage shaft 7 and its two ends are fixedly connected to the yarn winding bobbin 6 by screws, pins, or welding. The drive shaft 1 has a second sliding groove 12 that slides with the second connecting piece 10. The second sliding groove 12 extends along the length direction of the drive shaft 1. The arrangement of the second connecting piece 10 allows the yarn winding bobbin 6 to move along the length direction of the drive shaft 1 and also to rotate with the drive shaft 1.

[0037] The linkage-type yarn feeder in this embodiment also includes a first assembly 60 and a second assembly 70. The switcher 4 is fitted onto the outer periphery of the drive shaft 1 via the first assembly 60, and the yarn bobbin 6 is fitted onto the outer periphery of the drive shaft 1 via the second assembly 70. The first assembly 60 needs to have a third groove corresponding to the first groove 11, and the second assembly 70 needs to have a fourth groove corresponding to the second groove 12. The first assembly 60 is preferably a hexagonal stud, which is fixedly fitted onto the outer periphery of the drive shaft 1, while the switcher 4 is slidably fitted onto the outer periphery of the first assembly 60. The second assembly 70 is preferably a cylinder. The second assembly 70 can be an integral structure with the yarn bobbin 6, or it can be a separate structure connected by welding. The second assembly 70 can move with the yarn bobbin 6, and its top is limited by a limiting baffle fitted onto the outer periphery of the drive shaft 1.

[0038] The first transmission wheel 2 is provided with a first limiting groove 21 that cooperates with the switch 4 at one end near the second transmission wheel 3, and the second transmission wheel 3 is provided with a second limiting groove 31 that cooperates with the switch 4 at one end near the first transmission wheel 2.

[0039] The switcher 4 has a third limiting groove 41 at one end near the second transmission wheel 3, and the first reset spring 8 is fitted into the third limiting groove 41.

[0040] The linkage-type yarn feeder also includes a yarn quantity adjustment mechanism 20. The yarn quantity adjustment mechanism 20 includes an adjustment knob 201 mounted on the drive shaft 1 and located at the bottom of the yarn bobbin 6, and a second return spring 202 mounted inside the yarn bobbin 6 and cooperating with the adjustment knob 201. The adjustment knob 201 is threadedly engaged with the drive shaft 1. Thus, by adjusting the knob 201, the compression of the second return spring 202 can be adjusted, thereby adjusting the magnitude of the thrust generated by the second return spring 202 on the yarn bobbin 6. The direction of this thrust is opposite to the direction in which the yarn bobbin 6 moves downward. The more the second return spring 202 is compressed, the greater the thrust, and the more yarn is needed for the yarn bobbin 6 to move downward; conversely, the less the second return spring 202 is compressed, the smaller the thrust, and the less yarn is needed for the yarn bobbin 6 to move downward.

[0041] The bottom of the yarn bobbin is provided with a fourth limiting groove 61 that cooperates with the second return spring 202.

[0042] The linkage yarn feeder also includes a first mounting frame 50, which is mounted on the loom. The drive shaft 1 is rotatably mounted in the first mounting frame 50 through a bearing and passes through the first mounting frame 50. The first drive wheel 2, the second drive wheel 3, and the switch 4 are located above the first mounting frame 50, while the pressing wheel 5 and the winding cylinder 6 are located below the first mounting frame 50.

[0043] The linkage yarn feeder also includes a yarn introduction mechanism 30, which is used to introduce yarn into the yarn winding bobbin 6;

[0044] The yarn introduction mechanism 30 includes a second mounting frame 301 mounted on the first mounting frame 50, and a first yarn guide hole 302, a yarn tensioner 303, a yarn selector 304, a second yarn guide hole 305, and a third yarn guide hole 306 mounted on the second mounting frame 301. The yarn selector 304 is provided with a plurality of fourth yarn guide holes 304a. The yarn is introduced into the yarn winding bobbin 6 by passing through the first yarn guide hole 302, the yarn tensioner 303, the fourth yarn guide holes 304a of the yarn selector 304, the second yarn guide hole 305, and the third yarn guide hole 306 in sequence.

[0045] The linkage yarn feeder also includes a yarn lead-out mechanism 40, which is used to lead the yarn from the yarn bobbin 6 to the loom;

[0046] The yarn lead-out mechanism 40 includes a third mounting frame 401 mounted on the first mounting frame 50, and a fifth yarn guide hole 402 and a sixth yarn guide hole (located on the side of the third mounting frame 401, not shown in the figure) mounted on the third mounting frame 401. During non-fixed length yarn feeding, the yarn is led out to the loom through the fifth yarn guide hole 402. During fixed length yarn feeding, the yarn is led out to the loom through the sixth yarn guide hole.

[0047] The linkage yarn feeder in this embodiment may also include existing structures such as a stop-stop control and indicator mechanism; the specific principles will not be elaborated here.

[0048] The linkage yarn feeder in this embodiment also includes a dust cover 80. The dust cover 80 is fitted around the outer periphery of the drive shaft 1 and located at the top of the yarn winding cylinder 6. The dust cover 80 can be fixedly connected to the first mounting bracket 50 by fasteners such as screws. The pressure roller 5 can be inclinedly fitted at the bottom of the dust cover 80 by bearings and is covered by the dust cover 80. The dust cover 80 can provide dust protection and at the same time realize the inclined installation of the pressure roller 5.

[0049] The working principle of the linkage yarn feeder of the present invention is as follows:

[0050] During non-fixed-length yarn feeding, the rotational speed of the first drive wheel 2 (e.g., set to 100 r / min) is greater than that of the second drive wheel 3 (e.g., set to 10 r / min), and the switch 4 is engaged with the first drive wheel 2. The yarn is introduced through the yarn introduction mechanism 30, wound several times on the yarn bobbin 6, and then led out to the loom through the yarn lead-out mechanism 40. Two transmission belts connected to the loom drive drive respectively drive the first drive wheel 2 and the second drive wheel 3 to rotate. The second drive wheel 3 is equipped with a one-way bearing inside. 32. Because the rotational speed of the second transmission wheel 3 is lower than that of the first transmission wheel 2, it cannot drive the transmission shaft 1 to rotate. The rotation of the transmission shaft 1 is then driven by the first transmission wheel 2. The yarn bobbin 6 rotates synchronously with the transmission shaft 1 to wind the yarn, and the yarn introduction speed (100 r / min at this time) is higher than the extraction speed (assuming the extraction speed is 80 r / min). The amount of yarn on the yarn bobbin 6 gradually increases, causing the friction between the yarn and the yarn bobbin 6 to gradually increase. When the amount of yarn wound on the yarn bobbin 6 reaches a certain level, the yarn... The frictional force between the yarn winding bobbin 6 and the yarn winding cylinder 6 is greater than the restoring force of the first return spring 8. Under the action of this frictional force and the pressure of the yarn by the pressure roller 5, the yarn winding bobbin 6 moves downward relative to the drive shaft 1. The downward movement of the yarn winding bobbin 6 drives the linkage shaft 7 to move downward. The linkage shaft 7 drives the switch 4 to move downward and disengage from the first drive wheel 2. At the same time, the switch 4 compresses the first return spring 8. At this time, the first drive wheel 2 can no longer drive the drive shaft 1 to rotate. The drive shaft 1 is driven to rotate by the second drive wheel 3. The yarn winding bobbin 6 rotates synchronously with the drive shaft 1 and the speed decreases. The introduced speed at this time... When the speed is less than the lead-out speed, the amount of yarn wound on the yarn bobbin 6 decreases continuously. When the loom continuously uses yarn to reduce the amount of yarn wound on the yarn bobbin 6 to a certain level, the friction between the yarn and the yarn bobbin 6 is less than the reset force of the first reset spring 8. Under the action of the first reset spring 8, the switch 4 resets and engages with the first transmission wheel 2. The reset of the switch 4 drives the linkage shaft 7 to reset, and the reset of the linkage shaft 7 drives the yarn bobbin 6 to reset. After the reset, the yarn bobbin 6 and the transmission shaft 1 rotate synchronously under the drive of the first transmission wheel to wind yarn, and this cycle continues.

[0051] When the yarn is fed in a fixed length, the switcher 4 can be combined with the first drive wheel 2 or the second drive wheel 3. It is only necessary to set the lead-in speed and lead-out speed to be the same. In this mode, the yarn is introduced through the yarn lead-in mechanism 30 and wound around the yarn bobbin 6 several times before being led out to the loom through the yarn lead-out mechanism 40. The first drive wheel 2 or the second drive wheel 3 drives the drive shaft 1 to rotate. The yarn bobbin 6 rotates synchronously with the drive shaft 1. At this time, the lead-in speed and lead-out speed are the same, the amount of yarn on the yarn bobbin 6 remains constant, the yarn bobbin 6 does not produce axial displacement, and the linkage shaft 7 does not produce axial displacement.

[0052] The linkage yarn feeder of the present invention has at least the following advantages over yarn feeders in the prior art:

[0053] 1. The linkage yarn feeder of the present invention can realize both fixed-length yarn feeding and non-fixed-length yarn feeding, and has strong applicability;

[0054] 2. The power source of this yarn feeder is the transmission on the loom, which is a centralized transmission. The loom generally operates 24 hours a day without stopping. The yarn feeder can be driven by the inertia of the loom, without the need for additional drive, thus saving energy.

[0055] 3. Both fixed-length and non-fixed-length yarn feeding are completed in the same yarn feeder. The two modes can be switched by simply adjusting the speed of the transmission belt and operating the switcher 4. The switching method is flexible.

[0056] 4. The non-fixed length yarn feeding is completed by using a linkage structure, which eliminates the need for motors or other driving components. The non-fixed length yarn feeding can be completed through its own mechanical structure, resulting in low cost and a significant reduction in overall size and space occupation. It can also be assembled into a larger loom.

[0057] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A linkage-type yarn feeder, characterized in that, The system includes a drive shaft (1), a first drive wheel (2), a second drive wheel (3), a switch (4), a pressure wheel (5), a yarn winding bobbin (6), a linkage shaft (7), a first return spring (8), a first connecting piece (9), and a second connecting piece (10). The first drive wheel (2), switch (4), second drive wheel (3), pressure wheel (5), and yarn winding bobbin (6) are arranged sequentially from top to bottom along the drive shaft (1). The linkage shaft (7) is movably fitted inside the drive shaft (1). The upper end of the 7) is slidably engaged with the drive shaft (1) and fixedly connected to the switch (4), and the lower end is slidably engaged with the drive shaft (1) and fixedly connected to the yarn winding cylinder (6). The first return spring (8) is fitted on the outer periphery of the drive shaft (1) and located between the switch (4) and the second drive wheel (3). A one-way bearing (32) is fitted inside the second drive wheel (3). The second drive wheel (3) is fitted on the outer periphery of the drive shaft (1) through the one-way bearing (32). The first connecting piece (9) is installed on the upper end of the linkage shaft (7) and its two ends are fixedly connected to the switch (4). The transmission shaft (1) has a first sliding groove (11) that slides with the first connecting piece (9). The first sliding groove (11) extends along the length direction of the transmission shaft (1). The second connecting piece (10) is installed at the lower end of the linkage shaft (7) and its two ends are fixedly connected to the yarn winding cylinder (6). The transmission shaft (1) has a second sliding groove (12) that slides with the second connecting piece (10). The second sliding groove (12) extends along the length direction of the transmission shaft (1). The first transmission wheel (2) is provided with a first limiting groove (21) that cooperates with the switch (4) at one end near the second transmission wheel (3), and the second transmission wheel (3) is provided with a second limiting groove (31) that cooperates with the switch (4) at one end near the first transmission wheel (2); During non-fixed-length yarn supply, the rotational speed of the first transmission wheel (2) is made greater than that of the second transmission wheel (3), and the switch (4) is engaged with the first transmission wheel (2). The yarn is introduced and wound around the yarn bobbin (6) several times before being drawn out. The first transmission wheel (2) drives the transmission shaft (1) to rotate. The yarn bobbin (6) rotates synchronously with the transmission shaft (1) to wind the yarn, and the speed at which the yarn is introduced is higher than the speed at which it is drawn out. The amount of yarn on the yarn bobbin (6) gradually increases. When the amount of yarn wound on the yarn bobbin (6) increases to a certain extent, the yarn bobbin (6) moves downward relative to the transmission shaft (1). The downward movement of the yarn bobbin (6) drives the linkage shaft (7) to move downward. The linkage shaft (7) drives the switch (4) to move down and disengage from the first transmission wheel (2). At the same time, the switch (4) compresses the first reset spring (8). At this time, the transmission shaft (1) is driven to rotate through the second transmission wheel (3). The yarn winding bobbin (6) rotates synchronously with the transmission shaft (1) and the speed decreases. When the loom continuously uses yarn to reduce the amount of yarn wound on the yarn winding bobbin (6) to a certain level, the switch (4) resets under the action of the first reset spring (8), drives the linkage shaft (7) to reset, and the linkage shaft (7) drives the yarn winding bobbin (6) to reset. The yarn winding bobbin (6) rotates synchronously with the transmission shaft (1) to wind yarn, and this cycle continues. During the fixed-length yarn supply operation, the switch (4) is engaged with the first transmission wheel (2) or the second transmission wheel (3) to make the lead-in speed and lead-out speed consistent. The amount of yarn on the yarn winding cylinder (6) remains constant. The yarn winding cylinder (6) does not produce axial displacement, and the linkage shaft (7) does not produce axial displacement.

2. The linkage yarn feeder according to claim 1, characterized in that, The switch (4) has a third limiting groove (41) at one end near the second transmission wheel (3), and the first reset spring (8) is fitted into the third limiting groove (41).

3. The linkage yarn feeder according to claim 1, characterized in that, It also includes a yarn quantity adjustment mechanism (20), which includes an adjustment knob (201) fitted on the drive shaft (1) and located at the bottom of the yarn winding cylinder (6) and a second return spring (202) fitted inside the yarn winding cylinder (6) and cooperating with the adjustment knob (201). The adjustment knob (201) is threadedly engaged with the drive shaft (1).

4. The linkage yarn feeder according to claim 3, characterized in that, The bottom of the yarn winding cylinder (6) is provided with a fourth limiting groove (61) that cooperates with the second reset spring (202).

5. The linkage yarn feeder according to any one of claims 1-4, characterized in that, It also includes a first mounting frame (50), which is mounted on the loom. The drive shaft (1) is rotatably mounted on the first mounting frame (50) and can pass through the first mounting frame (50). The first drive wheel (2), the second drive wheel (3), and the switch (4) are located above the first mounting frame (50), and the pressing wheel (5) and the winding cylinder (6) are located below the first mounting frame (50).

6. The linkage yarn feeder according to claim 5, characterized in that, It also includes a yarn introduction mechanism (30) for introducing yarn into the winding bobbin (6); The yarn introduction mechanism (30) includes a second mounting frame (301) mounted on the first mounting frame (50) and a first yarn guide hole (302), a yarn tensioner (303), a yarn selector (304), a second yarn guide hole (305), and a third yarn guide hole (306) mounted on the second mounting frame (301). The yarn selector (304) is provided with a plurality of fourth yarn guide holes (304a). The yarn is introduced into the yarn winding bobbin (6) by passing through the first yarn guide hole (302), the yarn tensioner (303), the fourth yarn guide hole (304a) of the yarn selector (304), the second yarn guide hole (305), and the third yarn guide hole (306) in sequence.

7. The linkage yarn feeder according to claim 5, characterized in that, It also includes a yarn lead-out mechanism (40) for leading the yarn from the yarn bobbin (6) to the loom; The yarn lead-out mechanism (40) includes a third mounting frame (401) mounted on the first mounting frame (50) and a fifth yarn guide hole (402) mounted on the third mounting frame (401), through which the yarn is led out to the loom.

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