A yarn feeding device

Abstract

The yarn feeding device disclosed by the application comprises a mounting bracket and a shuttle, the mounting bracket is composed of a base and a top base, one end of the top base is hinged to the base through a shaft joint part, a rocker arm is rotatably installed on one side of the top base, the rear end of the shuttle is rotatably connected with the rocker arm, a guide rod is fixedly arranged on the shaft joint part, the shuttle is provided with a guide groove in which the guide rod is sleeved, a multi-point adjusting mechanism is arranged on the mounting bracket, the multi-point adjusting mechanism comprises a rotary driver, a jacking driver and a supporting driver, the guide rod is provided with a first rolling structure on the circumferential side, a guide rail is inlaid in the guide groove, and a limiting pad plate is arranged on each side of the guide rod, and the inner surface of each limiting pad plate is provided with a second rolling structure. The rotary driver is used for controlling the reciprocating of the shuttle, the jacking driver is used for adjusting the height, the supporting driver is used for further adjusting the posture, and the guide rod and the rolling structure are combined to reduce the friction, suppress the deflection, ensure the accurate and stable yarn feeding track of the shuttle and adapt to the high-speed weaving demand of various products.

Description

Technical Field

[0001] This invention relates to the field of textile machine parts technology, specifically to a yarn feeding device. Background Technology

[0002] In yarn feeding devices used for knitting hosiery, yarn feeding assemblies are arranged in groups to guide the yarn from the yarn frame to the knitting needle area for weaving. Each yarn feeding assembly has a shuttle at its front end, which precisely feeds the corresponding yarn into the knitting needle through its extension action. The shuttle head is usually a fixed structure, and its position, angle, and yarn feeding path are limited after manufacturing, making it impossible to flexibly adjust at multiple points according to yarn type, tension changes, or fabric structure requirements. This results in limited yarn feeding accuracy, making it difficult to achieve precise yarn feeding when knitting complex patterns or multi-material yarns.

[0003] For example, a Chinese utility model patent (authorization announcement number CN211057365U) discloses a double-cylinder knitting machine thread feeding assembly, including a shuttle and a cylinder. The shuttle is connected to the cylinder. A screw cavity is provided in the length direction of the cylinder. A screw is provided inside the screw cavity. Compressed gas is introduced into one end of the screw cavity to drive the screw to move so as to drive the shuttle to extend and feed the thread. Compressed gas is introduced into the other end of the screw cavity to drive the screw to move and drive the shuttle to reset.

[0004] In the aforementioned prior art, the shuttle is driven by a cylinder to extend, feed yarn, and return to its original position. This cylinder is a double-acting cylinder to ensure the shuttle does not jam during movement. Gears and a screw convert the linear motion of the cylinder into the curvilinear motion of the shuttle, thus altering the stroke. Although this yarn feeding assembly achieves bidirectional drive and curvilinear motion of the shuttle, significant friction is generated during reciprocating motion. This not only increases energy consumption and accelerates component wear but also easily leads to motion lag, trajectory deviation, and the risk of jamming, making it difficult to meet the demands of high-precision, long-life weaving.

[0005] Therefore, there is a current need for a yarn feeding device that allows for multi-point adjustment of the shuttle, reduces motion wear, and ensures precise and controllable yarn feeding trajectory. Summary of the Invention

[0006] To address the problems existing in the prior art, a yarn feeding device is provided. It controls the shuttle reciprocating through a rotary driver, adjusts the height through a lifting driver, and further adjusts the posture through a support driver. Combined with a guide rod and a rolling structure, it reduces friction, suppresses sway, and ensures that the shuttle's yarn feeding trajectory is accurate and stable, adapting to the needs of high-speed weaving of various products.

[0007] To address the problems of existing technologies, this invention provides a yarn feeding device, including a mounting bracket and a shuttle disposed at its front end. The front end of the shuttle has a guide hole for the yarn to pass through. The mounting bracket consists of a base and a top seat. One end of the top seat is hinged to the base via a shaft connection. A rocker arm is rotatably mounted on one side of the top seat. The rear end of the shuttle is rotatably connected to the rocker arm. A guide rod is fixedly mounted on the shaft connection. The shuttle has a guide groove along its length that fits onto the guide rod, allowing the shuttle to reciprocate along the guide rod under the drive of the rocker arm. The mounting bracket is provided with... A multi-point adjustment mechanism for adjusting the shuttle's thread feeding position includes a rotary driver mounted on a top seat and connected to a rocker arm, a lifting driver mounted on a base and connected to the top seat, and a support driver mounted on the top seat and connected to the base. A first rolling structure is provided around the guide rod, and a guide rail that rolls with the first rolling structure is embedded in the guide groove. Limiting pads are provided on the guide rod and on both sides of the shuttle, forming a limiting gap between the two limiting pads. A second rolling structure that contacts the shuttle is provided on the inner surface of each limiting pad.

[0008] Preferably, the first rolling structure includes a plurality of first balls arranged circumferentially around the guide rod, the surface of the guide rod is provided with a groove for the first balls to be embedded, and the inner side of the guide rail is provided with a raceway that matches the first balls.

[0009] Preferably, one of the two limiting pads is a fixed pad and the other is a movable pad. The fixed pad is fixedly sleeved on the end of the guide rod near the shaft connection, and the movable pad is movably sleeved on the end of the guide rod away from the shaft connection. A compression spring is fixedly connected between the movable pad and the guide rod.

[0010] Preferably, the shuttle is in the shape of a long strip, and both sides of its surface are smooth planes that roll in contact with the second rolling structure. The second rolling structure includes a plurality of second balls arranged circumferentially around the fixed pad and the movable pad, and the surfaces of the fixed pad and the movable pad are respectively provided with grooves for the corresponding second balls to be embedded.

[0011] Preferably, a shaft is rotatably connected between the rocker arm and the top seat. The rotary driver includes a gear fixedly mounted on the shaft and a gear meshing with it. The top seat has a first air chamber for the gear to move back and forth. The front and rear ends of the first air chamber are respectively connected to a front push air passage and a rear push air passage.

[0012] Preferably, the lifting driver includes a top rod vertically mounted on the base. The base has a second air chamber for the top rod to move up and down. The lower half of the second air chamber is connected to an upper pressure air passage. The upper end of the top rod extends upward through the base, and the lower end of the top rod extends downward through the base. The lower end of the top rod is provided with a limiting block for controlling the lifting range.

[0013] Preferably, the support actuator includes a strut vertically mounted on a top seat, and the top seat has a third air chamber for the strut to move up and down. The upper half of the third air chamber is connected to a downward pressure air passage, and the lower end of the strut extends downward through the top seat.

[0014] Preferably, a tension spring for resetting the top seat downwards is provided at the end away from the shaft connection between the base and the top seat, and the base and the top seat are respectively provided with connecting parts for mounting the two ends of the tension spring.

[0015] Preferably, one end of the shaft is axially connected to the top seat and extends outward through the top seat. The extended end is provided with a rotating block. The top seat is provided with two limiting stops parallel to the axis of the rack. The two limiting stops are spaced apart along the height direction of the top seat to form a limiting space for limiting the up-and-down swing angle of the rotating block.

[0016] Preferably, the base has an adjusting bolt at one end near the shaft connection for abutting the lower surface of the top seat and for setting the top seat reset termination angle by adjusting the extension length.

[0017] The advantages of this application compared to the prior art are:

[0018] 1. This invention constructs a multi-point coordinated adjustment mechanism through three independent pneumatic actuators: a rotary actuator, a lifting actuator, and a support actuator. The rotary actuator precisely controls the reciprocating motion of the shuttle using rack and pinion transmission, achieving reliable yarn feeding without spring return. The lifting actuator drives the top seat to rotate around the shaft joint, dynamically adjusting the overall height of the shuttle. The support actuator provides rigid downward support after lifting, preventing vibration and fall back and supporting fine-tuning;

[0019] The three elements work together to allow the shuttle to flexibly adapt to different yarn and pattern requirements in terms of height, angle, and stroke, thereby improving yarn feeding accuracy and operational stability.

[0020] 2. The present invention constructs a rolling guide structure by setting a first ball embedded in a groove in the circumference of the guide rod and configuring a matching guide rail inside the shuttle guide groove;

[0021] As the shuttle reciprocates along the guide rod, the first ball rolls synchronously between the guide rod groove and the guide rail raceway, transforming traditional sliding friction into multi-point contact rolling friction. This reduces motion resistance and wear, effectively suppresses temperature rise, improves operational stability and trajectory repeatability, and ensures that the device maintains high yarn feeding consistency and reliability even during long-term operation.

[0022] 3. This invention uses fixed and movable pads on both sides of the guide rod, combined with compression springs, to form an elastic limiting gap, and second rolling balls are arranged circumferentially on the inner side of the two pads to form a second rolling structure. During the reciprocating motion of the shuttle, the smooth surfaces on both sides of the shuttle maintain rolling contact with the second rolling balls, achieving low-friction guidance;

[0023] The movable pad automatically compensates for gap changes under the preload of the spring, ensuring that the shuttle is stably clamped without loosening or hard impact. It effectively suppresses lateral sway and torsion, converting sliding friction into rolling friction, reducing wear and running resistance, ensuring stable shuttle posture and accurate trajectory, and improving the repeatability and long-term reliability of yarn feeding. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a yarn feeding device of the present invention, facing forward.

[0025] Figure 2 This is a three-dimensional structural diagram of the back side of a yarn feeding device according to the present invention.

[0026] Figure 3 This is a partial three-dimensional structural schematic diagram of a yarn feeding device according to the present invention.

[0027] Figure 4 This is a three-dimensional structural diagram of the shuttle and guide rod of a yarn feeding device according to the present invention.

[0028] Figure 5 This is a partial planar sectional view of the shuttle and guide rod of a yarn feeding device according to the present invention.

[0029] Figure 6 This is a partial three-dimensional structural cross-sectional view of the shuttle and guide rod of a yarn feeding device according to the present invention.

[0030] Figure 7 This is a three-dimensional structural diagram of the guide rod, the first rolling structure, and the second rolling structure of a yarn feeding device according to the present invention.

[0031] Figure 8 This is a partial three-dimensional structural cross-sectional view of the rotary drive of a yarn feeding device according to the present invention.

[0032] Figure 9 This is a partial three-dimensional structural cross-sectional view of the lifting drive of a yarn feeding device according to the present invention.

[0033] Figure 10 This is a partial three-dimensional structural cross-sectional view of the support driver of a yarn feeding device according to the present invention.

[0034] Figure 11 This is a partial three-dimensional structural cross-sectional view of the limiting stop and rotating block of a yarn feeding device according to the present invention.

[0035] Figure 12 This is a partial three-dimensional structural cross-sectional view of the adjusting bolt of a yarn feeding device according to the present invention.

[0036] The following are the labels in the diagram: 1. Shuttle; 11. Yarn guide hole; 12. Guide rail; 2. Base; 21. Tension spring; 211. Connecting part; 22. Adjusting bolt; 3. Top seat; 4. Shaft connection; 41. Guide rod; 411. Fixed pad; 412. Movable pad; 4121. Compression spring; 42. First ball bearing; 43. Second ball bearing; 5. Rocker arm; 51. Shaft; 511. Rotating block; 512. Limiting stop; 52. Gear; 6. Gear rack; 61. Front push air passage; 62. Rear push air passage; 7. Top rod; 71. Upper pressure air passage; 72. Limiting stop; 8. Support rod; 81. Lower pressure air passage. Detailed Implementation

[0037] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0038] See Figures 1-8 As shown, a yarn feeding device includes a mounting bracket and a shuttle 1 disposed at its front end. The front end of the shuttle 1 has a yarn guide hole 11 for the yarn to pass through. The mounting bracket consists of a base 2 and a top seat 3. One end of the top seat 3 is hinged to the base 2 via a shaft connection 4. A rocker arm 5 is rotatably mounted on one side of the top seat 3. The rear end of the shuttle 1 is rotatably connected to the rocker arm 5. A guide rod 41 is fixedly disposed on the shaft connection 4. The shuttle 1 has a guide groove along its length that fits onto the guide rod 41, so that the shuttle 1 reciprocates along the guide rod 41 under the drive of the rocker arm 5. The mounting bracket is provided with adjustment... The multi-point adjustment mechanism for the thread feeding position of the shuttle 1 includes a rotary driver mounted on the top seat 3 and connected to the rocker arm 5, a lifting driver mounted on the base 2 and connected to the top seat 3, and a support driver mounted on the top seat 3 and connected to the base 2. The guide rod 41 is provided with a first rolling structure around its periphery. The guide groove is embedded with a guide rail 12 that rolls with the first rolling structure. Limiting pads are provided on the guide rod 41 and on both sides of the shuttle 1, forming a limiting gap between the two limiting pads. The inner surface of each limiting pad is provided with a second rolling structure that contacts the shuttle 1.

[0039] See Figures 3-7 As shown, the first rolling structure includes a plurality of first balls 42 arranged circumferentially around the guide rod 41. The surface of the guide rod 41 is provided with a groove for the first balls 42 to be embedded in, and the inner side of the guide rail 12 is provided with a raceway that matches the first balls 42.

[0040] During the reciprocating motion of the shuttle 1 along the guide rod 41, the first rolling structure plays a low-friction guiding role. Specifically, a number of first balls 42 are evenly arranged around the guide rod 41 and embedded in grooves opened on the surface of the guide rod 41 to form stable rolling support points. At the same time, the guide rail 12 is provided with raceways that precisely match the first balls 42.

[0041] When the shuttle 1 slides, the first ball 42 rolls synchronously between the groove of the guide rod 41 and the raceway of the guide rail 12, transforming the large-area sliding friction between the inner wall of the guide groove and the guide rod 41 into rolling friction with multiple points of contact. This process reduces motion resistance, effectively suppresses heat accumulation and surface wear generated by reciprocating motion, and improves the stability and trajectory repeatability of the shuttle 1, ensuring that high yarn feed consistency can be maintained even during long-term operation.

[0042] See Figures 4-7 As shown, one of the two limiting pads is a fixed pad 411, and the other limiting pad is a movable pad 412. The fixed pad 411 is fixedly sleeved on the end of the guide rod 41 near the shaft connection 4, and the movable pad 412 is movably sleeved on the end of the guide rod 41 away from the shaft connection 4. A compression spring 4121 is fixedly connected between the movable pad 412 and the guide rod 41.

[0043] During the reciprocating motion of the shuttle 1, the limiting pads on both sides together form a dynamically stable limiting gap. The fixed pad 411 is rigidly fitted onto the end of the guide rod 41 near the shaft connection 4, its position remaining unchanged, serving as a reference limiting surface. The movable pad 412 is slidably fitted onto the end of the guide rod 41 away from the shaft connection 4, and is elastically connected to the guide rod 41 via a compression spring 4121.

[0044] When the shuttle 1 experiences slight axial movement due to inertia or external disturbances during operation, the movable pad 412 automatically conforms to the side of the shuttle 1 under the preload of the compression spring 4121, compensating for gap changes in real time and maintaining a constant limiting gap. Simultaneously, the elastic clamping force provided by the compression spring 4121 ensures that the shuttle 1 is always gently and stably clamped between the two pads, preventing loosening and wobbling, and avoiding impacts and wear caused by rigid collisions. This ensures guiding accuracy while improving operational stability and component durability.

[0045] See Figures 4-7 As shown, the shuttle 1 is in the shape of a long strip, and both sides of its surface are smooth planes that roll in contact with the second rolling structure. The second rolling structure includes a number of second balls 43 arranged circumferentially around the fixed pad 411 and the movable pad 412 respectively. The surfaces of the fixed pad 411 and the movable pad 412 are respectively provided with grooves for the corresponding second balls 43 to be embedded.

[0046] During the reciprocating motion of the shuttle 1, it always maintains rolling contact with the second rolling structure inside the fixed pad 411 and the movable pad 412. The second rolling structure consists of several second balls 43 arranged circumferentially around the fixed pad 411 and the movable pad 412, forming a stable rolling support point.

[0047] When the shuttle 1 moves along the guide rod 41, the smooth planes on both sides of the shuttle 1 achieve low-friction rolling contact with the second ball 43, which effectively suppresses lateral sway and torsion, and at the same time converts sliding friction into rolling friction, reducing wear and running resistance, ensuring that the shuttle 1 always maintains a stable posture and accurate trajectory in reciprocating motion, and improving the repeatability and long-term reliability of the yarn feeding action.

[0048] During the actual operation of the yarn feeding device, the yarn feeding action unfolds in a highly coordinated mechanical motion sequence to ensure that the yarn can be delivered to the knitting needle area accurately, stably, and without damage. The entire process begins when the shuttle 1 is in a retracted and ready state, at which time the yarn guide hole 11 at its front end is in a safe position away from the knitting needle to avoid interference with the needle cylinder or other moving parts.

[0049] When the loom control system issues a yarn feeding command based on the current weaving pattern, the drive mechanism starts, causing the rocker arm 5 to swing forward around its axis. Since the rear end of the shuttle 1 is rotatably connected to the rocker arm 5, the swing of the rocker arm 5 directly translates into a thrust on the rear of the shuttle 1, causing the shuttle 1 to move forward as a whole. However, the shuttle 1 does not move freely; its trajectory is precisely constrained, and the guide groove on the shuttle 1 is always fitted onto the guide rod 41. The guide rod 41 serves as the reference axis for the reciprocating motion of the shuttle 1. Under the push of the rocker arm 5, the shuttle 1 is forced to extend along the guide rod 41. This ensures that regardless of how the rocker arm 5 swings, the yarn guide hole 11 at the front end of the shuttle 1 can accurately reach the predetermined yarn feeding point in front of the needle tongue along a highly repetitive path, achieving high-precision yarn feeding.

[0050] As the shuttle 1 extends forward, its contact with the guide rod 41 is not through traditional sliding friction, but rather through a rolling pair to achieve low-resistance motion. Specifically, when the shuttle 1 slides, the guide rail 12 and the first rolling structure roll together, transforming the original surface contact sliding into point contact rolling, significantly reducing the coefficient of friction, reducing energy loss, and effectively suppressing the temperature rise and wear caused by high-speed reciprocating motion, thereby improving the lifespan and operational stability of the shuttle 1.

[0051] Meanwhile, as the shuttle 1 moves, the limiting pads on both sides of the guide rod 41 form a precisely controlled limiting gap that perfectly accommodates the shuttle 1 body. As the shuttle 1 reciprocates, the second rolling structures on both sides continuously roll and support it, which not only effectively prevents the shuttle 1 from swaying or twisting during movement, but also reduces friction and ensures the straightness and repeatability of the yarn feeding trajectory.

[0052] When the yarn guide hole 11 at the front end of the shuttle 1 reaches the target position, the yarn is accurately fed into the knitting needle area, completing one yarn feeding cycle. Subsequently, the rocker arm 5 swings in the opposite direction, driving the shuttle 1 to smoothly return to the initial position along the original path, ready for the next cycle. The entire reciprocating process is smooth, quiet, and shock-free, thanks to the synergistic effect of multiple sets of rolling structures, overcoming the defects of cylinder direct drive being prone to jamming and having high friction.

[0053] When the loom needs to switch between different yarn types, tension parameters, or weaving patterns, the control system can activate three independent pneumatic actuators to coordinately adjust the spatial posture and motion reference of shuttle 1. Specifically:

[0054] The rotary actuator moves, driving the rocker arm 5 and shuttle 1 to complete the reciprocating motion of extending or resetting. This drive method eliminates the traditional spring return, ensuring reliable operation without lag.

[0055] The lifting drive intervenes to adjust the overall height of the shuttle 1 by rotating the entire top seat 3 upwards around the shaft joint 4. This action can adapt to different cylinder heights or yarn path requirements.

[0056] The support driver responds further, abutting against the base 2 to form a support, preventing the top seat 3 from falling back due to vibration during high-speed yarn feeding, and continuing to raise the overall height of the shuttle 1.

[0057] See Figure 1 and Figure 8 As shown, a shaft 51 is rotatably connected between the rocker arm 5 and the top seat 3. The rotary driver includes a gear 52 fixedly mounted on the shaft 51 and a toothed rod 6 meshing with it. The top seat 3 has a first air chamber for the toothed rod 6 to move back and forth. The front and rear ends of the first air chamber are respectively connected to a front push air passage 61 and a rear push air passage 62.

[0058] The rack 6 is a piston rod with a rack structure. Sealing rings are provided at both ends of the rack 6 to form an airtight chamber with front and rear isolation in the first air chamber.

[0059] During yarn feeding, the rotary actuator precisely controls the swing of the rocker arm 5 pneumatically. The rack 6, as a composite component combining the functions of a rack and a piston, has sealing rings at both ends and is slidably installed in the first air chamber inside the top seat 3, dividing the air chamber into two independent airtight chambers. The front push air passage 61 and the rear push air passage 62 are connected to these two chambers respectively.

[0060] When compressed gas enters the rear chamber through the rear air passage 62, it pushes the rack 6 outward, causing the meshing gear 52 and shaft 51 to rotate clockwise. The rocker arm 5 swings forward, extending the shuttle 1. Conversely, when compressed gas enters the front chamber through the front air passage 61, it pushes the rack 6 inward, causing the meshing gear 52 and shaft 51 to rotate counterclockwise. This causes the rocker arm 5 to swing backward, resetting the shuttle 1.

[0061] The entire process achieves bidirectional drive through alternating air supply, eliminating the traditional spring reset structure. The action response is rapid and without lag, and the sealing ring ensures effective transmission of air chamber pressure, guaranteeing stable and reliable drive.

[0062] See Figure 9 As shown, the lifting drive includes a lifting rod 7 vertically mounted on the base 2. The base 2 has a second air chamber for the lifting rod 7 to move up and down. The lower half of the second air chamber is connected to an upper pressure air passage 71. The upper end of the lifting rod 7 extends upward through the base 2, and the lower end of the lifting rod 7 extends downward through the base 2. The lower end of the lifting rod 7 is provided with a limiting block 72 for controlling the lifting range.

[0063] Two sealing rings are arranged axially on the top rod 7 to form an airtight chamber in the second air chamber that is connected to the upper pressure air passage 71.

[0064] During the yarn feeding process, the lifting actuator uses air pressure to controllably raise the height of the top seat 3. Compressed gas enters the lower half of the second air chamber inside the base 2 through the upper pressure air passage 71, acting on the airtight chamber formed by the two axially spaced sealing rings on the top rod 7, generating an upward thrust that pushes the top rod 7 upward. The upper end of the top rod 7 extends out of the base 2 and abuts against the top seat 3, thereby causing the top seat 3 to rotate upward around the shaft joint 4, thus adjusting the overall height of the shuttle 1.

[0065] The lower end of the push rod 7 extends downward and is equipped with a limit stop 72 to control the upper limit range of the push rod 7. Two sealing rings ensure reliable sealing of the air chamber, so that the air pressure can be efficiently converted into a stable and controllable lifting force, ensuring the accuracy and repeatability of height adjustment.

[0066] See Figure 10 As shown, the support actuator includes a strut 8 vertically mounted on the top seat 3. The top seat 3 has a third air chamber for the strut 8 to move up and down. The upper half of the third air chamber is connected to a downward pressure air passage 81. The lower end of the strut 8 extends downward through the top seat 3.

[0067] The upper end of the support rod 8 is provided with a sealing ring, which is used to form an airtight chamber in the third air chamber that is connected to the downward pressure air passage 81.

[0068] After the top seat 3 is raised to the target height, the support actuator provides rigid locking and auxiliary support pneumatically. Compressed gas enters the upper half of the third air chamber inside the top seat 3 through the downward pressure air passage 81, acting on the area above the sealing ring at the upper end of the support rod 8, forming a downward airtight chamber. The air pressure pushes the support rod 8 downward, causing its lower end to pass through the top seat 3 and abut against the upper surface of the base 2. This action not only applies additional downward pressure to the top seat 3, preventing it from falling back due to vibration or impact during high-speed yarn feeding, but also allows for further adjustment of the top seat 3's posture when needed.

[0069] The sealing ring ensures effective sealing and transmission of air pressure, making the support action responsive, stable and reliable, thus ensuring that the shuttle 1 can maintain a precise yarn feeding position even under complex working conditions.

[0070] See Figure 2 and Figure 8 As shown, a tension spring 21 for resetting the top seat 3 downwards is provided at the end away from the shaft connection part 4 between the base 2 and the top seat 3. The base 2 and the top seat 3 are respectively provided with connecting parts 211 for mounting the two ends of the tension spring 21.

[0071] After the top seat 3 completes the lifting action, if the air pressure is unloaded or a quick reset is required, the tension spring 21 plays a passive reset role. When the lifting driver or support driver releases the pressure, the tension spring 21 relies on its own elastic contraction force to continuously pull the free end of the top seat 3 downward, causing the top seat 3 to smoothly rotate back to the initial low position around the shaft joint 4.

[0072] It not only ensures that the top seat 3 can be reliably reset in a powerless state, avoiding stagnation caused by insufficient gravity or mechanical clearance, but also effectively buffers the impact during the reset process, improves the smoothness of movement, and provides a consistent starting reference for the next adjustment cycle.

[0073] See Figure 8 and Figure 11 As shown, one end of the shaft 51 is axially connected to the top seat 3 and extends outward through the top seat 3. The extended end is provided with a rotating block 511. The top seat 3 is provided with two limiting stops 512 parallel to the axis of the rack 6. The two limiting stops 512 are spaced apart along the height direction of the top seat 3 to form a limiting space for limiting the up and down swing angle of the rotating block 511.

[0074] During the swing of the rocker arm 5, the shaft 51 rotates synchronously with it, and drives the rotating block 511 on the extension end of the top seat 3 to move together. In order to prevent the rotating block 511 from swinging excessively up and down due to inertia or aerodynamic impact, the top seat 3 is provided with two limiting stops 512 parallel to the axis of the rack 6. The two are arranged at intervals along the height direction to form a vertical limiting space.

[0075] When the rotating block 511 swings up or down to its limit position, its edge will contact the corresponding limit stop 512, thus being mechanically blocked and effectively limiting its swing angle range. This not only prevents the gear 52 and rack 6 from disengaging or jamming due to overtravel, but also ensures the consistency of the rocker arm 5's stroke and the safety of the mechanism's operation.

[0076] See Figure 3 and Figure 12 As shown, the base 2 has an adjusting bolt 22 at one end near the shaft connection 4, which is used to abut against the lower surface of the top seat 3 and to set the reset termination angle of the top seat 3 by adjusting the extension length.

[0077] During the downward reset process of the top seat 3, its end near the shaft connection 4 will gradually approach the adjusting bolt 22 provided on the base 2. The top end of the adjusting bolt 22 is opposite to the lower surface of the top seat 3, and its extension length can be adjusted by rotation.

[0078] When the top seat 3 rotates to the set angle, its lower surface contacts the top of the adjusting bolt 22. The bolt acts as a mechanical stop, precisely limiting the termination position of the top seat 3's reset. By adjusting the extension of the adjusting bolt 22, the tilt angle of the top seat 3 after reset can be precisely controlled, thereby providing a suitable yarn feeding reference posture for different yarn types or weaving processes, ensuring the consistency and repeatability of the yarn feeding path.

[0079] This invention improves the accuracy and reliability of the yarn feeding device by integrating multi-dimensional pneumatic adjustment and rolling guide structure. On the one hand, the three-unit coordinated adjustment mechanism consisting of a rotary driver, a lifting driver, and a support driver respectively realizes the reciprocating stroke control of the shuttle 1, the dynamic adjustment of the overall height, and the rigid posture locking, so that the shuttle 1 can flexibly adapt to different yarn and pattern requirements in terms of height, angle, and stroke dimensions.

[0080] On the other hand, in terms of motion guidance, by embedding the first ball 42 circumferentially in the guide rod 41 and cooperating with the raceway of the guide rail 12 in the guide groove of the shuttle 1, a low-friction rolling pair is constructed, which transforms sliding friction into point contact rolling, effectively reducing resistance, temperature rise and wear.

[0081] Meanwhile, the guide rod 41 is provided with an elastic rolling limiting structure on both sides, consisting of a fixed pad 411, a movable pad 412, a compression spring 4121 and a second ball 43. The movable pad 412 automatically compensates for the gap under the action of the spring, ensuring that the shuttle 1 is stably clamped. Its smooth surfaces on both sides continuously roll in contact with the second ball 43, suppressing lateral swaying and twisting.

[0082] It ensures high repeatability of the shuttle's motion trajectory, posture stability, and long-term operational reliability, meeting the stringent requirements of high-speed, high-quality knitting production for consistent yarn feeding.

[0083] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A yarn feeding device, comprising a mounting bracket and a shuttle disposed at its front end, the front end of the shuttle having a yarn guide hole for yarn to pass through; Its features are, The mounting bracket consists of a base and a top mount, with one end of the top mount hinged to the base via a shaft connection. A rocker arm is rotatably mounted on one side of the top seat, and the rear end of the shuttle is rotatably connected to the rocker arm. A guide rod is fixedly provided on the shaft connection. The shuttle has a guide groove sleeved on the guide rod along its length direction so that the shuttle reciprocates along the guide rod under the drive of the rocker arm. The mounting bracket is equipped with a multi-point adjustment mechanism for adjusting the shuttle thread feeding position; The multi-point adjustment mechanism includes a rotary driver mounted on the top seat and connected to the rocker arm drive, a lifting driver mounted on the base and connected to the top seat, and a support driver mounted on the top seat and connected to the base. The guide rod is provided with a first rolling structure on its periphery, and a guide rail is embedded in the guide groove to roll in cooperation with the first rolling structure; The guide rod is provided with limiting pads on both sides of the shuttle, and a limiting gap is formed between the two limiting pads. The inner surface of each limiting pad is provided with a second rolling structure that contacts the shuttle. The first rolling structure includes a plurality of first balls arranged circumferentially around the guide rod. The guide rod surface has a groove for the first balls to be embedded in, and the inner side of the guide rail has a raceway that matches the first balls. One of the two limiting pads is a fixed pad, and the other limiting pad is a movable pad. The fixed pad is fixedly sleeved on the end of the guide rod near the shaft connection, and the movable pad is movably sleeved on the end of the guide rod away from the shaft connection. A compression spring is fixedly connected between the movable pad and the guide rod. The shuttle is in the shape of a long strip, and both sides of its surface are smooth planes that roll in contact with the second rolling structure. The second rolling structure includes a number of second balls arranged circumferentially around the fixed pad and the movable pad, respectively. The surfaces of the fixed pad and the movable pad are respectively provided with grooves for the corresponding second balls to be embedded.

2. The yarn feeding device according to claim 1, characterized in that, A shaft is rotatably connected between the rocker arm and the top seat. The rotary drive includes a gear fixedly mounted on the shaft and a gear meshing with it. The top seat has a first air chamber for the gear to move back and forth. The front and rear ends of the first air chamber are respectively connected to a front push air passage and a rear push air passage.

3. The yarn feeding device according to claim 1, characterized in that, The lifting actuator includes a top rod vertically mounted on a base. The base has a second air chamber for the top rod to move up and down. The lower half of the second air chamber is connected to an upper pressure air passage. The upper end of the top rod extends upward through the base, and the lower end of the top rod extends downward through the base. The lower end of the top rod is provided with a limit stop for controlling the lifting range.

4. A yarn feeding device according to claim 1, characterized in that, The support actuator includes a strut vertically mounted on a top seat. The top seat has a third air chamber inside for the strut to move up and down. The upper half of the third air chamber is connected to a downward pressure air passage. The lower end of the strut extends downward through the top seat.

5. A yarn feeding device according to claim 3, characterized in that, A tension spring is provided at the end away from the shaft joint between the base and the top seat for resetting the top seat downwards. The base and the top seat are respectively provided with connecting parts for mounting the two ends of the tension spring.

6. A yarn feeding device according to claim 2, characterized in that, One end of the shaft is connected to the top seat and extends outward through the top seat. A rotating block is provided at the extended end. Two limiting stops are provided on the top seat, which are parallel to the axis of the rack. The two limiting stops are spaced apart along the height direction of the top seat to form a limiting space to limit the up and down swing angle of the rotating block.

7. A yarn feeding device according to claim 5, characterized in that, An adjusting bolt is provided at one end of the base near the shaft connection, which is used to abut against the lower surface of the top seat and to set the reset termination angle of the top seat by adjusting the extension length.

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