Linkage type yarn conveyor

Abstract

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

Description

Technical Field

[0001] The invention relates to the technical field of knitting machinery and equipment, and in particular to a linkage type yarn feeder. Background Art

[0002] The yarn feeder is an important component of the circular knitting machine. The yarn feeder mainly includes a shell and a main shaft and a feed wheel installed thereon. The feed wheel is sleeved with a yarn pressing ring and a tension disk. The main shaft is at the center of the feed wheel, and the main shaft drives the feed wheel to rotate to store yarn. Yarn storage is the yarn feeding and storage on the feed wheel, and yarn feeding is the yarn output from the feed wheel through the tension disk. When producing high-quality weft knitted fabrics, in order to control the size of the weaving coils and stabilize the yarn tension during weaving, it is necessary to equip a yarn feeder that ensures the quality of yarn feeding. There are currently two main types of yarn feeders available: one is regular yarn feeding, also called an active yarn feeder or a fixed-length yarn feeder. It does not require an active motor, but uses the strips equipped on the knitting machine as a power source, which has the advantage of energy saving. However, since it can only supply yarn in a quantitative manner, it cannot be used in the jacquard process. The other is an electronic yarn storage device suitable for irregular yarn feeding, also called a non-fixed-length yarn supply and delivery device. A motor is set in the yarn storage device, and the yarn detection system inside the yarn storage device is used to decide whether to start the motor to drive the yarn storage wheel to fill the yarn according to the detection status of the yarn. Although it can meet the needs of irregular yarn feeding and is suitable for jacquard technology, an independent motor needs to be set inside each yarn storage device, which not only makes its size larger, but also has high cost and high energy consumption.

[0003] In the prior art, in order to enable a production machine to have both regular yarn feeding and irregular yarn feeding functions, it is generally achieved by setting up two sets of yarn feeding systems, wherein all the yarn feeders of one set of yarn feeding systems are regular yarn feeding yarn feeders, and all the yarn feeders of the other set of yarn feeding systems are electronic yarn feeders with irregular yarn feeding. Since all the yarn feeders of each set of yarn feeding systems are distributed 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 object of the present invention is to provide a linked yarn feeder which can at least solve one of the above problems.

[0005] According to one aspect of the present invention, a linkage type yarn feeder is provided, comprising a transmission shaft, a first transmission wheel, a second transmission wheel, a switch, a yarn pressing wheel, a yarn winding drum, a linkage shaft and a first return spring, wherein the first transmission wheel, the switch, the second transmission wheel, the yarn pressing wheel and the yarn winding drum are sequentially arranged along the transmission shaft from top to bottom, the linkage shaft can be movably sleeved in the transmission shaft, the upper end of the linkage shaft is slidably matched with the transmission shaft and is fixedly connected to the switch, and the lower end is slidably matched with the transmission shaft and is fixedly connected to the yarn winding drum, the first return spring is sleeved on the outer periphery of the transmission shaft and is located between the switch and the second transmission wheel, a one-way bearing is sleeved inside the second transmission wheel, and the second transmission wheel is sleeved on the outer periphery of the transmission shaft through the one-way bearing;

[0006] When the yarn is wound on the yarn drum, the speed of the first transmission wheel is greater than that of the second transmission wheel, and the switch is combined with the first transmission wheel, the yarn is introduced and wound on the yarn drum for several turns before being led out, the first transmission wheel drives the transmission shaft to rotate, the yarn drum and the transmission shaft rotate synchronously to wind the yarn, and the speed of yarn introduction is higher than the speed of yarn leading out, and the yarn amount on the yarn drum gradually increases. When the yarn wound on the yarn drum increases by a certain amount, the yarn drum moves downward relative to the transmission shaft, the downward movement of the yarn drum drives the linkage shaft to move downward, and the linkage shaft drives the switch to move downward and disengage from the first transmission wheel. At the same time, the switch compresses the first reset spring. At this time, the transmission shaft is driven to rotate by the second transmission wheel, the yarn drum and the transmission shaft rotate synchronously and the speed is reduced. When the loom continuously uses the yarn, the yarn wound on the yarn drum is reduced to a certain amount, the switch is reset under the action of the first reset spring, driving the linkage shaft to reset, and the linkage shaft drives the yarn drum to reset, and the yarn drum and the transmission shaft rotate synchronously to wind the yarn, and this cycle is repeated.

[0007] When the fixed-length yarn supply is working, the switch is combined with the first transmission wheel or the second transmission wheel to make the introduction speed and the withdrawal speed consistent, the yarn amount on the yarn winding drum remains constant, the yarn winding drum does not produce axial displacement, and the linkage shaft does not produce axial displacement.

[0008] In some embodiments, the linked yarn feeder also includes a first connecting plate, which is installed on the upper end of the linkage shaft and has both ends fixedly connected to the switch. The transmission shaft is provided with a first sliding groove that slides with the first connecting plate, and the first sliding groove extends along the length direction of the transmission shaft.

[0009] In some embodiments, the linked yarn feeder also includes a second connecting plate, which is installed at the lower end of the linked shaft and has both ends fixedly connected to the yarn winding drum. The transmission shaft is provided with a second sliding groove that slides with the second connecting plate, and the second sliding groove extends along the length direction of the transmission shaft.

[0010] In some embodiments, a first limiting groove cooperating with the switch limiting is provided at one end of the first transmission wheel close to the second transmission wheel, and a second limiting groove cooperating with the switch limiting is provided at one end of the second transmission wheel close to the first transmission wheel.

[0011] In some embodiments, a third limiting groove is provided at one end of the switch close to the second transmission wheel, and the first return spring is sleeved in the third limiting groove.

[0012] In some embodiments, the linked yarn feeder further includes a yarn quantity adjustment mechanism, which includes an adjustment knob mounted on the transmission shaft and located at the bottom end of the yarn winding drum, and a second return spring mounted in the yarn winding drum and matched with the adjustment knob, and the adjustment knob is threadedly matched with the transmission shaft. Thus, the compression amount of the second return spring can be adjusted by the adjustment knob, thereby adjusting the magnitude of the thrust generated by the second return spring on the yarn winding drum, and the direction of the thrust is opposite to the direction when the yarn winding drum moves downward, the more the second return spring is compressed, the greater the thrust, and the more yarn quantity is required for the yarn winding drum to move downward, and vice versa, the less the second return spring is compressed, the smaller the thrust, and the less yarn quantity is required for the yarn winding drum to move downward.

[0013] In some embodiments, a fourth limiting groove cooperating with the second return spring is provided at the bottom of the yarn tube.

[0014] In some embodiments, the linked yarn feeder also includes a first mounting frame, the first mounting frame is installed on the loom, the transmission shaft passes through the first mounting frame, the yarn pressure wheel is installed on the first mounting frame, the first transmission wheel, the second transmission wheel, and the switch are located above the first mounting frame, and the yarn pressure wheel and the yarn winding tube are located below the first mounting frame.

[0015] In some embodiments, the linked yarn feeder further comprises a yarn introduction mechanism, the yarn introduction mechanism being used to introduce the yarn into the yarn winding drum;

[0016] The yarn introduction mechanism includes a second mounting frame installed on the first mounting frame and a first yarn guide hole, a yarn tensioner, a thread selection plate, a second yarn guide hole and a third yarn guide hole installed on the second mounting frame. A plurality of fourth yarn guide holes are arranged on the thread selection plate. The yarn passes through the first yarn guide hole, the yarn tensioner, the fourth yarn guide hole of the thread selection plate, the second yarn guide hole and the third yarn guide hole in sequence and is introduced into the yarn winding drum.

[0017] In some embodiments, the linked yarn feeder further comprises a yarn lead-out mechanism, the yarn lead-out mechanism being used to lead the yarn from the yarn bobbin to the loom;

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

[0019] Beneficial effects of the present invention:

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

[0021] 2. The power source of the yarn feeder is the transmission on the loom instead of the centralized transmission. The loom generally works 24 hours a day without stopping. The inertia drive of the loom can drive the yarn feeder to operate, without the need for additional drive, which is energy-saving;

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

[0023] 4. The linkage structure is used to complete the non-fixed length yarn supply work, without the use of motors and other driving parts. The non-fixed length yarn supply work can be completed through its own mechanical structure. It is low in cost and can greatly reduce the overall volume, occupying little space, and can be assembled to form a larger loom.

[0024] In summary, the linked yarn feeder of the present invention has many advantages such as strong applicability, low cost, small size, energy saving, and flexible mode switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention after the yarn introduction mechanism and the yarn lead-out mechanism are omitted as a whole;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure of the linkage yarn feeder from above is shown;

[0028] Figure 4 for Figure 3 A schematic cross-sectional structural diagram of the linked yarn feeder along the AA direction shown;

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

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

[0031] Figures 1 to 6Reference numerals in the figure: 1-transmission shaft; 2-first transmission wheel; 3-second transmission wheel; 4-switch; 5-yarn pressing wheel; 6-yarn winding drum; 7-linkage shaft; 8-first return spring; 9-first connecting piece; 10-second connecting piece; 20-yarn amount adjustment mechanism; 30-yarn introduction mechanism; 40-yarn lead-out mechanism; 50-first mounting frame; 60-first set; 70-second set; 80-dust cover; 11-first slide groove; 12-second slide Slot; 21-first limiting slot; 31-second limiting slot; 32-one-way bearing; 41-third limiting slot; 61-fourth limiting slot; 201-adjusting knob; 202-second return spring; 301-second mounting bracket; 302-first yarn guide hole; 303-yarn tensioner; 304-line selection plate; 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 DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings.

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

[0034] like Figures 1 to 6 As shown, the linkage yarn feeder includes a transmission shaft 1, a first transmission wheel 2, a second transmission wheel 3, a switcher 4, a yarn pressing wheel 5, a yarn winding drum 6, a linkage shaft 7 and a first reset spring 8. The first transmission wheel 2, the switcher 4, the second transmission wheel 3, the yarn pressing wheel 5 and the yarn winding drum 6 are arranged in sequence from top to bottom along the transmission shaft 1. The linkage shaft 7 can be movably mounted in the transmission shaft 1. The upper end of the linkage shaft 7 is slidably matched with the transmission shaft 1 and is fixedly connected to the switcher 4, and the lower end is slidably matched with the transmission shaft 1 and is fixedly connected to the yarn winding drum 6. The first reset spring 8 is mounted on the outer periphery of the transmission shaft 1 and is located between the switcher 4 and the second transmission wheel 3. A one-way bearing 32 is mounted inside the second transmission wheel 3, and the second transmission wheel 3 is mounted on the outer periphery of the transmission shaft through the one-way bearing 32.

[0035] The linkage yarn feeder of this embodiment further includes a first connecting piece 9, which is mounted on the upper end of the linkage shaft 7 and fixedly connected to the switch 4 at both ends by screws, pins or welding, and the transmission shaft 1 is provided with a first slide groove 11 that is slidably matched with the first connecting piece 9, and the first slide groove 11 extends along the length direction of the transmission shaft 1. The arrangement of the first connecting piece 9 enables the switch 4 to move along the length direction of the transmission shaft 1 and to rotate with the transmission shaft 1.

[0036] The linkage yarn feeder of this embodiment further includes a second connecting piece 10, which is mounted on the lower end of the linkage shaft 7 and fixedly connected to the yarn drum 6 at both ends by screws, pins or welding, and the transmission shaft 1 is provided with a second slide groove 12 that is slidably matched with the second connecting piece 10, and the second slide groove 12 extends along the length direction of the transmission shaft 1. The second connecting piece 10 is provided so that the yarn drum 6 can move along the length direction of the transmission shaft 1 and can rotate with the transmission shaft 1.

[0037] The linkage yarn feeder of this embodiment further includes a first set 60 and a second set 70. The switch 4 is mounted on the outer periphery of the transmission shaft 1 through the first set 60, and the yarn drum 6 is mounted on the outer periphery of the transmission shaft 1 through the second set 70. A third slide corresponding to the first slide 11 needs to be provided on the first set 60, and a fourth slide corresponding to the second slide 12 needs to be provided on the second set 70. The first set 60 is preferably a hexagonal stud, and the first set 60 is fixedly mounted on the outer periphery of the transmission shaft 1, and the switch 4 can be slidably mounted on the outer periphery of the first set 60. The second set 70 is preferably a cylinder, and the second set 70 can be an integrated structure with the yarn drum 6, or a split structure connected by welding. The second set 70 can move with the yarn drum 6, and its top is limited by a limit stopper mounted on the outer periphery of the transmission shaft 1.

[0038] One end of the first transmission wheel 2 close to the second transmission wheel 3 is provided with a first limiting groove 21 which cooperates with the switch 4 , and one end of the second transmission wheel 3 close to the first transmission wheel 2 is provided with a second limiting groove 31 which cooperates with the switch 4 .

[0039] A third limiting groove 41 is provided at one end of the switch 4 close to the second transmission wheel 3 , and the first return spring 8 is sleeved in the third limiting groove 41 .

[0040] The linkage yarn feeder also includes a yarn quantity adjustment mechanism 20, which includes an adjustment knob 201 which is mounted on the transmission shaft 1 and located at the bottom end of the yarn winding drum 6, and a second return spring 202 which is mounted in the yarn winding drum 6 and matches the adjustment knob 201, and the adjustment knob 201 is threadedly matched with the transmission shaft 1. Thus, the compression amount of the second return spring 202 can be adjusted by adjusting the knob 201, thereby adjusting the magnitude of the thrust generated by the second return spring 202 on the yarn winding drum 6, and the direction of the thrust is opposite to the direction when the yarn winding drum 6 moves downward, the more the second return spring 202 is compressed, the greater the thrust, and the more yarn quantity is required for the yarn winding drum 6 to move downward, and vice versa, the less the second return spring 202 is compressed, the smaller the thrust, and the less yarn quantity is required for the yarn winding drum 6 to move downward.

[0041] The bottom of the yarn drum is provided with a fourth limiting groove 61 which matches with the second return spring 202 .

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

[0043] The linked yarn feeder further comprises a yarn introduction mechanism 30, which is used to introduce the yarn into the yarn winding drum 6;

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

[0045] The linked yarn feeder further comprises a yarn lead-out mechanism 40, which is used to lead the yarn from the yarn winding drum 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 (arranged on the side of the third mounting frame 401, not shown in the figure) mounted on the third mounting frame 401. When the non-fixed-length yarn supply is working, the yarn is led out to the loom through the fifth yarn guide hole 402. When the fixed-length yarn supply is working, the yarn is led out to the loom through the sixth yarn guide hole.

[0047] The linked yarn feeder of this embodiment may also include existing structures such as a yarn cutting and stopping control and an indicating mechanism, and the specific principles are not described in detail.

[0048] The linked yarn feeder of this embodiment further includes a dust cover 80, which is sleeved on the outer circumference of the transmission shaft 1 and located at the top of the yarn winding drum 6. The dust cover 80 can be fixedly connected to the first mounting frame 50 by fasteners such as screws, and the yarn pressing wheel 5 can be sleeved on the bottom of the dust cover 80 in an inclined manner through a bearing and covered by the dust cover 80. The dust cover 80 can play a dustproof effect and realize the inclined installation of the yarn pressing wheel 5.

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

[0050] When the non-fixed-length yarn supply is working, the speed of the first transmission wheel 2 (for example, set to 100r / min) is greater than the speed of the second transmission wheel 3 (for example, set to 10r / min) and the switch 4 is combined with the first transmission wheel 2, the yarn is introduced through the yarn introduction mechanism 30 and is wound on the yarn winding tube 6 for several turns before being led out to the loom through the yarn lead-out mechanism 40, and the two transmission belts connected to the loom drive drive drive respectively drive the first transmission wheel 2 and the second transmission wheel 3 to rotate, and a one-way bearing is arranged inside the second transmission wheel 3 32. Since the 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 driven by the first transmission wheel 2. The winding drum 6 rotates synchronously with the transmission shaft 1 to wind the yarn, and the speed of yarn introduction (100r / min at this time) is higher than the speed of yarn withdrawal (assuming the withdrawal speed is 80r / min). The amount of yarn on the winding drum 6 gradually increases, so that the friction between the yarn and the winding drum 6 also gradually increases. When the amount of yarn wound on the winding drum 6 reaches a certain amount, the yarn The friction force between the yarn winding drum 6 and the yarn pressing wheel 5 is greater than the reset force of the first reset spring 8. Under the action of the friction force and the yarn squeezing of the yarn by the yarn pressing wheel 5, the yarn winding drum 6 moves downward relative to the transmission shaft 1. The downward movement of the yarn winding drum 6 drives the linkage shaft 7 to move downward, and the linkage shaft 7 drives the switch 4 to move downward 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 first transmission wheel 2 cannot drive the transmission shaft 1 to rotate, and the transmission shaft 1 is driven to rotate by the second transmission wheel 3. The yarn winding drum 6 rotates synchronously with the transmission shaft 1 and the speed is reduced. At this time, the introduction speed When the speed is less than the lead-out speed, the yarn wound on the yarn drum 6 is continuously reduced. When the loom continuously uses the yarn so that the yarn wound on the yarn drum 6 is reduced to a certain amount, the friction between the yarn and the yarn drum 6 is less than the reset force of the first reset spring 8. The switch 4 is reset and combined with the first transmission wheel 2 under the action of the first reset spring 8. The reset of the switch 4 drives the linkage shaft 7 to reset. The reset of the linkage shaft 7 drives the yarn drum 6 to reset. After the reset, the yarn drum 6 and the transmission shaft 1 rotate synchronously under the drive of the first transmission wheel to wind the yarn, and this cycle continues.

[0051] When the fixed-length yarn is supplied, the switch 4 can be selected to be combined with the first transmission wheel 2 or the second transmission wheel 3. It is only necessary to set the introduction speed to be consistent with the lead-out speed. In this mode, the yarn is introduced through the yarn introduction mechanism 30 and is wound on the yarn winding drum 6 for several turns before being led out to the loom through the yarn lead-out mechanism 40. The first transmission wheel 2 or the second transmission wheel 3 drives the transmission shaft 1 to rotate, and the yarn winding drum 6 rotates synchronously with the transmission shaft 1. At this time, the introduction speed and the lead-out speed are consistent, the yarn amount on the yarn winding drum 6 remains constant, the yarn winding drum 6 does not produce axial displacement, and the linkage shaft 7 does not produce axial displacement.

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

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

[0054] 2. The power source of the yarn feeder is the transmission on the loom instead of the centralized transmission. The loom generally works 24 hours a day without stopping. The inertia drive of the loom can drive the yarn feeder to operate, without the need for additional drive, which is energy-saving;

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

[0056] 4. The linkage structure is used to complete the non-fixed length yarn supply work, without the use of motors and other driving parts. The non-fixed length yarn supply work can be completed through its own mechanical structure. It is low in cost and can greatly reduce the overall volume, occupying little space, and can be assembled to form a larger loom.

[0057] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A linked yarn feeder, characterized in that: The invention comprises a transmission shaft (1), a first transmission wheel (2), a second transmission wheel (3), a switch (4), a yarn pressing wheel (5), a yarn winding drum (6), a linkage shaft (7) and a first return spring (8); the first transmission wheel (2), the switch (4), the second transmission wheel (3), the yarn pressing wheel (5) and the yarn winding drum (6) are arranged in sequence from top to bottom along the transmission shaft (1); the linkage shaft (7) is movably sleeved in the transmission shaft (1); the upper end of the linkage shaft (7) is slidably matched with the transmission shaft (1) and is fixedly connected to the switch (4); the lower end of the linkage shaft (7) is slidably matched with the transmission shaft (1) and is fixedly connected to the yarn winding drum (6); the first return spring (8) is sleeved on the outer periphery of the transmission shaft (1) and is located between the switch (4) and the second transmission wheel (3); a one-way bearing (32) is sleeved inside the second transmission wheel (3); the second transmission wheel (3) is sleeved on the outer periphery of the transmission shaft (1) through the one-way bearing (32); When the non-fixed-length yarn supply is in operation, the rotation speed of the first transmission wheel (2) is greater than the rotation speed of the second transmission wheel (3) and the switch (4) is combined with the first transmission wheel (2), the yarn is introduced and is wound on the yarn winding drum (6) for several turns before being led out, the first transmission wheel (2) drives the transmission shaft (1) to rotate, the yarn winding drum (6) rotates synchronously with the transmission shaft (1) to wind the yarn and the speed of yarn introduction is higher than the speed of yarn withdrawal, the amount of yarn on the yarn winding drum (6) gradually increases, when the amount of yarn wound on the yarn winding drum (6) increases by a certain amount, the yarn winding drum (6) moves downward relative to the transmission shaft (1), and the downward movement of the yarn winding drum (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 transmission wheel (2). At the same time, the switch (4) compresses the first return spring (8). At this time, the transmission shaft (1) is driven to rotate through the second transmission wheel (3). The yarn winding drum (6) rotates synchronously with the transmission shaft (1) and the rotation speed is reduced. When the loom continuously uses yarn so that the yarn wound on the yarn winding drum (6) is reduced to a certain amount, the switch (4) is reset under the action of the first return spring (8), driving the linkage shaft (7) to reset. The linkage shaft (7) drives the yarn winding drum (6) to reset. The yarn winding drum (6) rotates synchronously with the transmission shaft (1) to wind the yarn, and this cycle is repeated. When the fixed-length yarn supply is in operation, the switch (4) is combined with the first transmission wheel (2) or the second transmission wheel (3) to make the introduction speed and the withdrawal speed consistent, the amount of yarn on the yarn winding drum (6) remains constant, the yarn winding drum (6) does not produce axial displacement, and the linkage shaft (7) does not produce axial displacement.

2. The linked yarn feeder according to claim 1, characterized in that: The transmission shaft (1) further comprises a first connecting piece (9), wherein the first connecting piece (9) is mounted on the upper end of the linkage shaft (7) and both ends are fixedly connected to the switch (4); the transmission shaft (1) is provided with a first sliding groove (11) which is slidably matched with the first connecting piece (9), and the first sliding groove (11) extends along the length direction of the transmission shaft (1).

3. The linked yarn feeder according to claim 2, characterized in that: The transmission shaft (1) further comprises a second connecting piece (10), wherein the second connecting piece (10) is mounted on the lower end of the linkage shaft (7) and the two ends are fixedly connected to the yarn winding drum (6); the transmission shaft (1) is provided with a second sliding groove (12) which is slidably matched with the second connecting piece (10), and the second sliding groove (12) extends along the length direction of the transmission shaft (1).

4. The linked yarn feeder according to claim 1, characterized in that: The first transmission wheel (2) is provided with a first limiting groove (21) for limiting the switch (4) at one end close to the second transmission wheel (3), and the second transmission wheel (3) is provided with a second limiting groove (31) for limiting the switch (4) at one end close to the first transmission wheel (2).

5. The linked yarn feeder according to claim 1, characterized in that: A third limiting groove (41) is provided at one end of the switch (4) close to the second transmission wheel (3), and the first return spring (8) is sleeved in the third limiting groove (41).

6. The linked yarn feeder according to claim 1, characterized in that: The invention also comprises a yarn quantity adjustment mechanism (20), wherein the yarn quantity adjustment mechanism (20) comprises an adjustment knob (201) which is sleeved on the transmission shaft (1) and located at the bottom end of the yarn winding drum (6), and a second return spring (202) which is sleeved in the yarn winding drum (6) and cooperates with the adjustment knob (201), and the adjustment knob (201) is threadedly cooperated with the transmission shaft (1).

7. The linked yarn feeder according to claim 6, characterized in that: The bottom of the yarn winding drum (6) is provided with a fourth limiting groove (61) which matches with the second return spring (202).

8. The linked yarn feeder according to any one of claims 1 to 7, characterized in that: The invention also comprises a first mounting frame (50), wherein the first mounting frame (50) is mounted on the loom, the transmission shaft (1) is rotatably mounted on the first mounting frame (50) and can pass through the first mounting frame (50), the first transmission wheel (2), the second transmission wheel (3) and the switch (4) are located above the first mounting frame (50), and the yarn pressing wheel (5) and the yarn winding drum (6) are located below the first mounting frame (50).

9. The linked yarn feeder according to claim 8, characterized in that: It also includes a yarn introduction mechanism (30), wherein the yarn introduction mechanism (30) is used to introduce the yarn into the yarn winding drum (6); The yarn introduction mechanism (30) includes a second mounting frame (301) installed on the first mounting frame (50) and a first yarn guide hole (302), a yarn tensioner (303), a thread selection plate (304), a second yarn guide hole (305) and a third yarn guide hole (306) installed on the second mounting frame (301), wherein the thread selection plate (304) is provided with a plurality of fourth yarn guide holes (304a), and the yarn is introduced into the yarn winding drum (6) through the first yarn guide hole (302), the yarn tensioner (303), the fourth yarn guide hole (304a) of the thread selection plate (304), the second yarn guide hole (305) and the third yarn guide hole (306) in sequence.

10. The linked yarn feeder according to claim 1, characterized in that: It also includes a yarn lead-out mechanism (40), wherein the yarn lead-out mechanism (40) is used to lead the yarn from the yarn winding drum (6) to the loom; The yarn lead-out mechanism (40) comprises 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), and the yarn is led out to the loom through the fifth yarn guide hole (402).

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