Linkage type yarn conveyor

Abstract

The utility model discloses a linkage type yarn conveying device which comprises a transmission shaft, a first transmission wheel, a second transmission wheel, a yarn pressing wheel and a yarn winding drum, the first transmission wheel, the second transmission wheel, the yarn pressing wheel and the yarn winding drum are arranged on the periphery of the transmission shaft in a sleeved mode, and the linkage type yarn conveying device further comprises a switcher and a linkage mechanism. The linkage mechanism is installed on the transmission shaft, and the two ends are connected with the switcher and the yarn winding barrel respectively. The switcher can be combined with the first transmission wheel or the second transmission wheel; when the switcher is combined with the first transmission wheel, the yarn conveyor can be suitable for non-fixed-length yarn supply work, and the switcher can be combined with the first transmission wheel or separated from the first transmission wheel under the action of the linkage mechanism. The linkage type yarn conveying device 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 utility model relates to the technical field of knitting machinery and equipment, in particular to a linked yarn feeder. Background Art

[0002] The yarn feeder is an important component of a circular knitting machine. It mainly consists of a shell and a main shaft and a feed wheel installed thereon. The feed wheel is sleeved with a yarn pressure ring and a tension disk. The main shaft is located at the center of the feed wheel, and the main shaft drives the feed wheel to rotate to store yarn. Yarn storage is the process of yarn feeding and storing it on the feed wheel, while yarn delivery is the process of yarn being 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, a yarn feeder device that ensures yarn quality is required. Currently, there are 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. It has the advantage of energy saving. However, since it can only supply yarn in a fixed quantity, it cannot be used in the jacquard process. The other type is an electronic yarn storage device suitable for irregular yarn feeding, also called a non-fixed-length yarn feeding device. A motor is installed in the yarn storage device, and the yarn detection system inside the yarn storage device is used to determine 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 must be installed inside each yarn storage device, which not only makes its volume larger, but also has high cost and high energy consumption.

[0003] In the prior art, in order to enable the production machine to have the functions of regular yarn feeding and irregular yarn feeding at the same time, it is generally achieved by setting up two sets of yarn feeding systems, in which all the yarn feeders of one set of yarn feeding systems adopt regular yarn feeding yarn feeders, and all the yarn feeders of the other set of yarn feeding systems adopt electronic yarn feeders with irregular yarn feeding. Since all the feeders of each set of yarn feeding systems are distributed in a circular array, the overall volume of the existing feeding system is limited by the electronic yarn feeders, and there is a problem of poor applicability, and there is room for improvement. Utility Model Content

[0004] The purpose of the utility model is to provide a linked yarn feeder, which can at least solve one of the above problems.

[0005] According to one aspect of the utility model, a linkage-type yarn feeder is provided, comprising a transmission shaft and a first transmission wheel, a second transmission wheel, a yarn pressing wheel, and a yarn winding drum sleeved on the outer circumference of the transmission shaft, and further comprising a switch and a linkage mechanism, wherein the switch is sleeved on the outer circumference of the transmission shaft and is located between the first transmission wheel and the second transmission wheel, and the linkage mechanism is mounted on the transmission shaft and has both ends connected to the switch and the yarn winding drum, respectively;

[0006] The switch can be combined with the first transmission wheel or the second transmission wheel;

[0007] When the switch is combined with the first transmission wheel, the yarn feeder can be suitable for non-fixed-length yarn feeding and the switch can be combined with or separated from the first transmission wheel under the action of the linkage mechanism.

[0008] In some embodiments, 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.

[0009] In some embodiments, the linkage mechanism includes a linkage rod and a first return spring. The linkage rod can be movably mounted in the transmission shaft. The upper end of the linkage rod slides with the transmission shaft and is fixedly connected to the switcher, and the lower end slides with the transmission shaft and is fixedly connected to the winding drum. The first return spring is mounted on the outer periphery of the transmission shaft and is located between the switcher and the second transmission wheel.

[0010] In some embodiments, the linkage mechanism also includes a first connecting member, which is installed on the upper end of the linkage rod 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 member, and the first sliding groove extends along the length direction of the transmission shaft.

[0011] In some embodiments, the linkage mechanism also includes a second connecting member, which is installed at the lower end of the linkage rod and has both ends fixedly connected to the winding drum. The transmission shaft is provided with a second sliding groove that slides with the second connecting member, and the second sliding groove extends along the length direction of the transmission shaft.

[0012] In some embodiments, a first limiting groove that cooperates with the switch is provided at one end of the first transmission wheel close to the second transmission wheel, and a second limiting groove that cooperates with the switch is provided at one end of the second transmission wheel close to the first transmission wheel.

[0013] 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.

[0014] In some embodiments, the linked yarn feeder further includes a yarn quantity adjustment mechanism, comprising an adjustment knob mounted on the transmission shaft and located at the bottom end of the winding drum, and a second return spring mounted within the winding drum and engaged with the adjustment knob, wherein the adjustment knob is threadedly engaged with the transmission shaft. Thus, the compression of the second return spring can be adjusted by turning the adjustment knob, thereby adjusting the thrust exerted by the second return spring on the winding drum. The thrust acts in the opposite direction to the direction in which the winding drum moves downward. The more the second return spring is compressed, the greater the thrust, and the more yarn is required to move the winding drum downward. Conversely, the less the second return spring is compressed, the smaller the thrust, and the less yarn is required to move the winding drum downward.

[0015] In some embodiments, a fourth limiting groove cooperating with the second return spring is provided at the bottom of the yarn bobbin.

[0016] In some embodiments, the linked yarn feeder also includes a first mounting frame and a dust cover, the first mounting frame is installed on the loom, the transmission shaft is rotatably mounted on the first mounting frame and can pass through the first mounting frame, the dust cover is mounted on the outer periphery of the transmission shaft and is fixedly connected to the first mounting frame, the yarn pressure wheel is tiltedly mounted on the bottom of the dust cover through a bearing and is covered by the dust cover, the first transmission wheel, the second transmission wheel, and the switch are located on one side of the first mounting frame, and the dust cover, the yarn pressure wheel, and the yarn winding drum are located on the other side of the first mounting frame.

[0017] Beneficial effects of the utility model:

[0018] 1. The linked yarn feeder of the utility model can realize both fixed-length yarn feeding and non-fixed-length yarn feeding, and has strong applicability;

[0019] 2. The power source of the yarn feeder is the loom drive power, which is centrally driven by the loom transmission belt. 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.

[0020] 3. Both fixed-length yarn feeding and non-fixed-length yarn feeding 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.

[0021] 4. The non-fixed-length yarn feeding can be completed by adopting a linkage structure, without the use of motors and other driving parts. The non-fixed-length yarn feeding can be completed by its own mechanical structure, which is low in cost and can greatly reduce the overall volume, occupying little space, and can be assembled to form a larger loom.

[0022] In summary, the linked yarn feeder of the utility model has many advantages such as strong applicability, low cost, small size, energy saving, and flexible mode switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model after the yarn introduction mechanism and the yarn lead-out mechanism are omitted as a whole;

[0025] Figure 3 for Figure 2 A schematic diagram of the structure of the linked yarn feeder shown in FIG.

[0026] Figure 4 for Figure 3 A schematic cross-sectional structural diagram of the linked yarn feeder taken along the AA direction is shown;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the transmission shaft of the present utility model;

[0028] Figure 6 This is a cross-sectional view of the utility model with some structures omitted.

[0029] Figures 1 to 6 Reference 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 mechanism; 8- yarn quantity adjustment mechanism; 9- yarn introduction mechanism; 10- yarn lead-out mechanism; 20- first mounting bracket; 30- first set; 40- second set; 50- dust cover; 11- first chute; 12- second chute; 21- first limiting groove; 31- second limiting groove; 32- one-way shaft Bearing; 41-third limiting slot; 61-fourth limiting slot; 71-linking rod; 72-first return spring; 73-first connecting member; 74-second connecting member; 81-adjusting knob; 82-second return spring; 91-second mounting bracket; 92-first yarn guide hole; 93-yarn tensioner; 94-line selection plate; 95-second yarn guide hole; 96-third yarn guide hole; 101-third mounting bracket; 102-fifth yarn guide hole; 941-fourth yarn guide hole. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Figures 1 to 6 The figure schematically shows a linked yarn feeder according to an embodiment of the present invention.

[0032] like Figures 1 to 6 As shown, the linked yarn feeder includes 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, and a linkage mechanism 7. 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 mechanism 7 is mounted on the transmission shaft 1 and is connected to the switch 4 and the yarn winding drum 6 at both ends.

[0033] The switch 4 can be combined with the first transmission wheel 2 or the second transmission wheel 3;

[0034] When the switch 4 is combined with the first transmission wheel 2 , the yarn feeder can be suitable for non-fixed-length yarn supply and the switch 4 can be combined with or separated from the first transmission wheel 2 under the action of the linkage mechanism 7 .

[0035] The linkage mechanism 7 includes a linkage rod 71 and a first return spring 72. The linkage rod 71 can be movably mounted in the transmission shaft 1. The upper end of the linkage rod 71 slides with the transmission shaft 1 and is fixedly connected to the switcher 4. The lower end slides with the transmission shaft 1 and is fixedly connected to the winding drum 6. The first return spring 72 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. The second transmission wheel 3 is mounted on the outer periphery of the transmission shaft 1 through the one-way bearing 32.

[0036] The linkage mechanism 7 also includes a first connecting member 73 and a second connecting member 74. The first connecting member 73 is installed at the upper end of the linkage rod 71 and its two ends are fixedly connected to the switch 4 by means of screws, pins or welding. The transmission shaft 1 is provided with a first sliding groove 11 that slides with the first connecting member 73, and the first sliding groove 11 extends along the length direction of the transmission shaft 1. The setting of the first connecting member 73 enables the switch 4 to move along the length direction of the transmission shaft 1 and to rotate with the transmission shaft 1. The second connecting member 74 is installed at the lower end of the linkage rod 71 and its two ends are fixedly connected to the winding drum 6 by means of screws, pins or welding. The transmission shaft 1 is provided with a second sliding groove 12 that slides with the second connecting member 74, and the second sliding groove 12 extends along the length direction of the transmission shaft 1. The setting of the second connecting member 74 enables the winding drum 6 to move along the length direction of the transmission shaft 1 and to rotate with the transmission shaft 1.

[0037] Preferably, the linkage rod 71 of this embodiment can be an axis-shaped member or a rod-shaped member, the first connecting member 73 and the second connecting member 74 can be a sheet-shaped member or a rod-shaped member, and the shapes of the corresponding first slide groove 11 and the second slide groove 12 should be adapted to the shapes of the first connecting member 73 and the second connecting member 74 respectively.

[0038] The linked yarn feeder of this embodiment also includes a first kit 30 and a second kit 40. The switch 4 is mounted on the outer periphery of the transmission shaft 1 through the first kit 30, and the yarn drum 6 is mounted on the outer periphery of the transmission shaft 1 through the second kit 40. A third chute corresponding to the first chute 11 needs to be provided on the first kit 30, and a fourth chute corresponding to the second chute 12 needs to be provided on the second kit 40. The first kit 30 is preferably a hexagonal stud. The first kit 30 is fixedly mounted on the outer periphery of the transmission shaft 1, and the switch 4 is slidably mounted on the outer periphery of the first kit 30. The second kit 40 is preferably a cylinder. The second kit 40 can be an integral structure with the yarn drum 6, or a split structure and connected by welding. The second kit 40 can move with the yarn drum 6, and its top is limited by a limit block mounted on the outer periphery of the transmission shaft 1.

[0039] The first transmission wheel 2 is provided with a first limiting groove 21 that cooperates with 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 that cooperates with the switch 4 at one end close to the first transmission wheel 2 .

[0040] 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 72 is sleeved in the third limiting groove 41 .

[0041] The linked yarn feeder also includes a yarn quantity adjustment mechanism 8, which includes an adjustment knob 81 mounted on the transmission shaft 1 and located at the bottom end of the winding drum 6, and a second return spring 82 mounted inside the winding drum 6 and engaged with the adjustment knob 81. The adjustment knob 81 is threadedly engaged with the transmission shaft 1. Thus, the compression of the second return spring 82 can be adjusted by adjusting the adjustment knob 81, thereby adjusting the magnitude of the thrust exerted by the second return spring 82 on the winding drum 6. The direction of this thrust is opposite to the direction in which the winding drum 6 moves downward. The more the second return spring 82 is compressed, the greater the thrust, and the more yarn is required to move the winding drum 6 downward. Conversely, the less the second return spring 82 is compressed, the smaller the thrust, and the less yarn is required to move the winding drum 6 downward.

[0042] The bottom of the yarn bobbin is provided with a fourth limiting groove 61 which cooperates with the second return spring 82 .

[0043] The linked yarn feeder also includes a first mounting frame 20, which is installed on the loom. The transmission shaft 1 passes through the first mounting frame 20, and the yarn pressure wheel 5 is installed on the first mounting frame 20. The first transmission wheel 2, the second transmission wheel 3, and the switch 4 are located above the first mounting frame 20, and the yarn pressure wheel 5 and the yarn winding drum 6 are located below the first mounting frame 20.

[0044] The linked yarn feeder further comprises a yarn introduction mechanism 9, which is used to introduce the yarn into the yarn winding drum 6;

[0045] The yarn introduction mechanism 9 includes a second mounting frame 91 installed on the first mounting frame 20 and a first yarn guide hole 92, a yarn tensioner 93, a thread selection plate 94, a second yarn guide hole 95 and a third yarn guide hole 96 installed on the second mounting frame 91. A plurality of fourth yarn guide holes 941 are provided on the thread selection plate 94. The yarn passes through the first yarn guide hole 92, the yarn tensioner 93, the fourth yarn guide hole 941 of the thread selection plate 94, the second yarn guide hole 95 and the third yarn guide hole 96 in sequence and is introduced into the yarn winding drum 6.

[0046] The linked yarn feeder further comprises a yarn lead-out mechanism 10, which is used to lead the yarn from the yarn drum 6 to the loom;

[0047] The yarn lead-out mechanism 10 includes a third mounting frame 101 mounted on the first mounting frame 20, and a fifth yarn guide hole 102 and a sixth yarn guide hole (arranged on the side of the third mounting frame 101, not shown in the figure) mounted on the third mounting frame 101. When the non-fixed-length yarn supply is working, the yarn is led out to the loom through the fifth yarn guide hole 102. When the fixed-length yarn supply is working, the yarn is led out to the loom through the sixth yarn guide hole.

[0048] The linked yarn feeder of this embodiment may further include existing structures such as a yarn break and stop control and an indication mechanism, and the specific principles thereof will not be elaborated herein.

[0049] The linked yarn feeder of this embodiment also includes a dust cover 50, which is mounted on the outer periphery of the transmission shaft 1 and located at the top of the yarn winding drum 6. The dust cover 50 is fixedly connected to the first mounting bracket 20 via screws or other fasteners. The pressure wheel 5 is tiltedly mounted on the bottom of the dust cover 50 via a bearing and is covered by the dust cover 50. The dust cover 50 provides dust protection and allows the pressure wheel 5 to be mounted at an angle.

[0050] The working principle of the linked yarn feeder of the utility model is:

[0051] When the non-fixed length yarn is supplied, the speed of the first transmission wheel 2 (for example, set to 100 r / min) is greater than the speed of the second transmission wheel 3 (for example, set to 10 r / min) and the switch 4 is combined with the first transmission wheel 2, the yarn is introduced through the yarn introduction mechanism 9 and is wound on the yarn winding drum 6 for several turns and then led out to the loom through the yarn lead-out mechanism 10. The two transmission belts connected to the loom drive drive respectively drive the first transmission wheel 2 and the second transmission wheel 3 to rotate. The second transmission wheel 3 is provided with a one-way bearing 3 inside. 2. 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 yarn wound on the winding drum 6 reaches a certain amount, the yarn and the winding drum are in a state of friction. The friction force between the yarn drums 6 is greater than the reset force of the first reset spring 72. Under the combined action of the friction force and the compression wheel 5 squeezing the yarn, the yarn drum 6 moves downward relative to the transmission shaft 1. The downward movement of the yarn drum 6 drives the linkage shaft to move downward, and the linkage shaft 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 72. 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 drum 6 rotates synchronously with the transmission shaft 1 and the speed is reduced. At this time, the introduction speed When the speed is lower than the withdrawal speed, the amount of yarn wound on the winding drum 6 is continuously reduced. When the loom continuously uses the yarn and the amount of yarn wound on the winding drum 6 is reduced to a certain amount, the friction between the yarn and the winding drum 6 is lower than the reset force of the first reset spring 72. The switch 4 is reset under the action of the first reset spring 72 and combined with the first transmission wheel 2. The reset of the switch 4 drives the linkage shaft to reset, and the reset of the linkage shaft drives the winding drum 6 to reset. After the reset, the winding drum 6 and the transmission shaft 1 rotate synchronously under the drive of the first transmission wheel 2 to wind the yarn, and this cycle continues.

[0052] 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-in speed. In this mode, the yarn is introduced through the yarn introduction mechanism 9 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 10. 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 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 does not produce axial displacement.

[0053] The linked yarn feeder of the present invention has at least the following advantages over the yarn feeders in the prior art:

[0054] 1. The linked yarn feeder of the utility model can realize both fixed-length yarn feeding and non-fixed-length yarn feeding, and has strong applicability;

[0055] 2. The power source of the yarn feeder is the loom drive power, which is centrally driven by the loom transmission belt. 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.

[0056] 3. Both fixed-length yarn feeding and non-fixed-length yarn feeding 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.

[0057] 4. The non-fixed-length yarn feeding can be completed by adopting a linkage structure, without the use of motors and other driving parts. The non-fixed-length yarn feeding can be completed by its own mechanical structure, which is low in cost and can greatly reduce the overall volume, occupying little space, and can be assembled to form a larger loom.

[0058] The above descriptions 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 inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A linked yarn feeder, comprising a transmission shaft (1) and a first transmission wheel (2), a second transmission wheel (3), a yarn pressing wheel (5) and a yarn winding drum (6) sleeved on the outer periphery of the transmission shaft (1), characterized in that: It also includes a switch (4) and a linkage mechanism (7), wherein the switch (4) is sleeved on the outer periphery of the transmission shaft (1) and is located between the first transmission wheel (2) and the second transmission wheel (3), and the linkage mechanism (7) is installed on the transmission shaft (1) and has two ends connected to the switch (4) and the yarn winding drum (6) respectively; The switch (4) can be combined with the first transmission wheel (2) or the second transmission wheel (3); When the switch (4) is combined with the first transmission wheel (2), the yarn feeder can be suitable for non-fixed-length yarn feeding and the switch (4) can be combined with or separated from the first transmission wheel (2) under the action of the linkage mechanism (7).

2. The linked yarn feeder according to claim 1, characterized in that: A one-way bearing (32) is sleeved inside the second transmission wheel (3), and the second transmission wheel (3) is sleeved on the outer periphery of the transmission shaft (1) through the one-way bearing (32).

3. The linked yarn feeder according to claim 1, characterized in that: The linkage mechanism (7) comprises a linkage rod (71) and a first return spring (72). The linkage rod (71) is movably mounted in the transmission shaft (1). The upper end of the linkage rod (71) is in sliding engagement with the transmission shaft (1) and is fixedly connected to the switch (4), while the lower end is in sliding engagement with the transmission shaft (1) and is fixedly connected to the winding drum (6). The first return spring (72) is mounted on the outer periphery of the transmission shaft (1) and is located between the switch (4) and the second transmission wheel (3).

4. The linked yarn feeder according to claim 3, characterized in that: The linkage mechanism (7) further includes a first connecting member (73), the first connecting member (73) being mounted on the upper end portion of the linkage rod (71) and having both ends fixedly connected to the switch (4), the transmission shaft (1) being provided with a first sliding groove (11) that is slidably engaged with the first connecting member (73), and the first sliding groove (11) extending along the length direction of the transmission shaft (1).

5. The linked yarn feeder according to claim 3, characterized in that: The linkage mechanism (7) further includes a second connecting member (74), which is mounted on the lower end of the linkage rod (71) and has both ends fixedly connected to the winding drum (6), and the transmission shaft (1) is provided with a second sliding groove (12) that is slidably engaged with the second connecting member (74), and the second sliding groove (12) extends along the length direction of the transmission shaft (1).

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

7. The linked yarn feeder according to claim 3, 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 (72) is sleeved in the third limiting groove (41).

8. The linked yarn feeder according to any one of claims 1 to 7, characterized in that: The invention also includes a yarn quantity adjustment mechanism (8), wherein the yarn quantity adjustment mechanism (8) includes an adjustment knob (81) 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 (82) which is mounted inside the yarn winding drum (6) and cooperates with the adjustment knob (81), and the adjustment knob (81) is threadedly engaged with the transmission shaft (1).

9. The linked yarn feeder according to claim 8, characterized in that: The bottom of the yarn winding drum (6) is provided with a fourth limiting groove (61) that matches the second return spring (82).

10. The linked yarn feeder according to any one of claims 1 to 7, characterized in that: The invention also includes a first mounting frame (20) and a dust cover (50), wherein the first mounting frame (20) is mounted on the loom, the transmission shaft (1) is rotatably mounted on the first mounting frame (20) and can pass through the first mounting frame (20), the dust cover (50) is mounted on the outer periphery of the transmission shaft (1) and is fixedly connected to the first mounting frame (20), the pressure wheel (5) is tiltedly mounted on the bottom of the dust cover (50) through a bearing and is covered by the dust cover (50), the first transmission wheel (2), the second transmission wheel (3) and the switch (4) are located on one side of the first mounting frame (20), and the dust cover (50), the pressure wheel (5) and the winding drum (6) are located on the other side of the first mounting frame (20).

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