A transmission mechanism for which the synchronization error between the needle plate and needle cylinder of a circular knitting machine is theoretically zero.

Abstract

This invention relates to a transmission mechanism for a circular knitting machine with a theoretically zero synchronization error between the needle disc and the needle cylinder. The mechanism includes a needle disc and a needle cylinder arranged opposite each other. The needle disc and needle cylinder are driven to rotate by the same servo motor. The servo motor is connected to the needle disc via a first transmission chain. The servo motor is connected to the needle cylinder via a second transmission chain. The first and second transmission chains have the same transmission ratio, thereby driving the needle disc and needle cylinder to rotate synchronously. This invention uses a single, novel drive source, the servo motor, to simultaneously drive two transmission chains with the same transmission ratio. Each transmission chain employs the shortest transmission path and precision machining and assembly methods to ensure the synchronization, reliability, and accuracy of transmission and rotation. Using one transmission chain as a reference, the other transmission chain is equipped with sensors and logic algorithms for rotation angle correction. A slip regulator synchronizes the rotation of the needle disc with the rotation of the needle cylinder, resulting in a theoretically zero synchronization error.

Description

Technical Field

[0001] This invention relates to the field of circular knitting machines, and more particularly to a transmission mechanism for which the theoretical error of the synchronization between the needle plate and the needle cylinder of a circular knitting machine is zero. Background Technology

[0002] In the double-sided knitting drive system of a circular knitting machine, the movement of the knitting needles needs to be well synchronized with the needle tracks of the corresponding needle plate and needle cylinder to ensure the quality of loop formation. However, in the existing drive chain design and use, the drive of the needle plate and the drive of the needle cylinder are two different drive chains with different drives, resulting in inconsistent rotation angles between the two and causing synchronization errors. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the aforementioned problems in the prior art, this invention provides a transmission mechanism with a theoretically zero synchronization error between the needle disc and the needle cylinder of a circular knitting machine.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] A transmission mechanism for a circular knitting machine with a theoretical synchronization error of zero between the needle plate and the needle cylinder is characterized by: comprising a needle plate and a needle cylinder arranged opposite to each other; the needle plate and the needle cylinder being driven to rotate by the same servo motor; the servo motor being connected to the needle plate through a first transmission chain; the servo motor being connected to the needle cylinder through a second transmission chain; the first transmission chain and the second transmission chain having the same transmission ratio, thereby driving the needle plate and the needle cylinder to rotate synchronously.

[0008] Furthermore, the output shaft of the servo motor is provided with a first synchronous pulley and a first gear; the first synchronous pulley is connected to the needle plate through a first transmission chain; the first gear meshes with a second gear; a second synchronous pulley is provided at the other end of the central shaft of the second gear; the second synchronous pulley is connected to the needle cylinder through a second transmission chain; the first synchronous pulley and the second synchronous pulley are the same size and rotate at the same speed.

[0009] Furthermore, the first transmission chain includes a first bevel gear pair; the two power transmission ends of the first bevel gear pair are respectively connected to a first synchronous pulley and a third synchronous pulley via a first synchronous belt and a second synchronous belt; the first synchronous pulley is connected to the output shaft of the servo motor; and the third synchronous pulley is connected to the needle plate rotating shaft of the needle plate.

[0010] Furthermore, the second transmission chain includes a second bevel gear pair; the two power transmission ends of the second bevel gear pair are respectively connected to the second synchronous pulley and the fourth synchronous pulley via the third synchronous belt and the fourth synchronous belt; a second gear is provided on the central shaft of the second synchronous pulley; the second gear meshes with the first gear on the output shaft of the servo motor; the fourth synchronous pulley is connected to the syringe shaft of the syringe.

[0011] Furthermore, the needle disc is equipped with a slip adjuster on its rotating shaft; and a position sensor is provided on the needle disc.

[0012] Furthermore, the needle plate is equipped with a position sensor for collecting the synchronization error value between the needle plate and the syringe; the second synchronization belt is equipped with a slip adjuster for correcting the rotation position of the needle plate according to the synchronization error value so that the needle plate and the syringe rotate synchronously.

[0013] Furthermore, the slip adjuster includes a micro motor and a lead screw component connected thereto; the lead screw component is connected to an adjusting component; the adjusting component is clamped on the second synchronous belt and its position does not change with the rotation of the second synchronous belt; the micro motor controls the movement of the lead screw component to adjust the distance between one side and the other side of the second synchronous belt, thereby changing the tension of the second synchronous belt.

[0014] Furthermore, the adjusting component includes an adjusting frame; the two ends of the adjusting frame are rotatably connected to an inner adjusting wheel located inside the second synchronous belt and an outer adjusting wheel located outside the second synchronous belt; the inner adjusting wheel is a synchronous belt pulley that is coupled and driven by the second synchronous belt.

[0015] Furthermore, the outer adjusting wheel has a spacer groove along its axial direction on its outer periphery; the synchronous teeth on the inner adjusting wheel are smaller than the synchronous teeth on the third synchronous belt pulley; the adjusting frame is equipped with a first pressure sensor for monitoring the pressure of the inner adjusting wheel and a second pressure sensor for monitoring the pressure of the outer adjusting wheel.

[0016] Furthermore, the transmission ratio between the first gear and the second gear is 1.

[0017] Furthermore, the first transmission chain and the second transmission chain are manufactured in the same batch, group, and step, and assembled using the same method.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this invention are: (1) It uses the same new drive source - servo motor - to drive two transmission chains with the same transmission ratio. Each transmission chain adopts the shortest transmission route and precision machining and assembly methods to ensure the synchronization, reliability and accuracy of transmission and rotation. The gears, synchronous pulleys, synchronous belts and other components designed and used in the two transmission chains are manufactured using the "same batch, same group, same work steps and same assembly method". Even if there are machining errors, the synchronization error between the two transmission chains is theoretically considered to be zero after they are installed in the same way.

[0020] (2) Based on the above transmission chain, the other transmission chain is equipped with sensors and logic algorithms to correct the rotation angle. The needle plate rotation is synchronized with the needle cylinder rotation through the slip regulator, and the synchronization error is theoretically zero. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the error compensation of the present invention;

[0024] Figure 3 This is a schematic diagram of the slip regulator structure of the present invention;

[0025] Figure 4 This is a perspective view of the slip regulator of the present invention;

[0026] Explanation of reference numerals in the attached figures:

[0027] 100-needle plate;

[0028] 110-Needle disc pivot;

[0029] 120-Slip Regulator;

[0030] 121-Micro motor;

[0031] 122 - Lead screw assembly;

[0032] 123 - External adjusting wheel;

[0033] 124 - Internal Adjustment Wheel;

[0034] 125 - Adjustment bracket;

[0035] 126 - First pressure sensor;

[0036] 127 - Second pressure sensor;

[0037] 130 - Third synchronous belt pulley;

[0038] 140 - Position sensor;

[0039] 200 syringes;

[0040] 210 - Syringe shaft;

[0041] 220 - Fourth synchronous belt pulley;

[0042] 300-servo motor;

[0043] 301 - Output shaft;

[0044] 302 - First synchronous belt pulley;

[0045] 303 - First Gear;

[0046] 304 - Second Gear;

[0047] 305 - Central axis;

[0048] 306 - Second synchronous belt pulley;

[0049] 310 - First transmission chain;

[0050] 311 - First Synchronous Belt;

[0051] 312 - First bevel gear pair;

[0052] 313 - Second synchronous belt;

[0053] 320 - Second transmission chain;

[0054] 321 - Third synchronous belt;

[0055] 322 - Second bevel gear pair;

[0056] 323 - Fourth Synchronous Belt;

[0057] 400 - Reference plane;

[0058] 500 - Reference position. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Example 1, please refer to Figure 1-4 As shown:

[0063] A transmission mechanism with zero theoretical error in the synchronization of the needle plate and needle cylinder of a circular knitting machine includes a needle plate 100 and a needle cylinder 200 arranged opposite to each other; the needle plate 100 and the needle cylinder 200 are driven to rotate by the same servo motor 300; by using the same drive source, the synchronization of the transmission can be guaranteed.

[0064] The output shaft 301 of the servo motor 300 is equipped with a first synchronous pulley 302 and a first gear 303; the first synchronous pulley 302 is connected to the first transmission chain 310 to drive the needle disc 100 to rotate; the first gear 303 meshes with the second gear 304, and the other end of the central shaft 305 of the second gear 304 is equipped with a second synchronous pulley 306; the second synchronous pulley 306 is connected to the second transmission chain 320 to drive the syringe 200 to rotate; the transmission ratios of the first transmission chain 310 and the second transmission chain 320 are the same, and the first synchronous pulley 302 is connected to the second transmission chain 320 to drive the syringe 200 to rotate. The pulley 302 and the second synchronous pulley 306 are the same size and rotate at the same speed, so that the needle disc 100 and the syringe 200 obtain the same position and angle, and the macroscopic synchronization error is zero. The function of the second gear 304 is to change the distance and rotation direction between the second synchronous pulley 306 and the first synchronous pulley 302, so that their rotation directions are opposite, so that the needle disc 100 and the syringe 200 have the same direction of rotation, and at the same time, it paves the way for the first transmission chain 310 and the second transmission chain 320 to adopt the shortest transmission route.

[0065] In one embodiment of the present invention, the first transmission chain 310 includes a first bevel gear pair 312; the two power transmission ends of the first bevel gear pair 312 are respectively connected to the first synchronous pulley 302 and the third synchronous pulley 130 via the first synchronous belt 311 and the second synchronous belt 313; the third synchronous pulley 130 is connected to the needle plate rotating shaft 110 of the needle plate 100; the first bevel gear pair 312 is a commonly used connection structure in the art, which usually includes two bevel gears that mesh with each other at a 90° angle. In this embodiment, it is connected to the first synchronous pulley 302 and the third synchronous pulley 130 via the first synchronous belt 311 and the second synchronous belt 313. Therefore, the rotating shaft of the bevel gear is also provided with a synchronous pulley connected to the synchronous belt to realize flexible connection transmission. The specific structure and parameter settings are not described in detail. It is a commonly used connection method in the art. The shortest transmission route of the first transmission chain 310 can be realized by connecting the first bevel gear pair 312 and the synchronous belt.

[0066] In one embodiment of the present invention, the second transmission chain 320 includes a second bevel gear pair 322; the two power transmission ends of the second bevel gear pair 322 are respectively connected to the second synchronous pulley 306 and the fourth synchronous pulley 220 via the third synchronous belt 321 and the fourth synchronous belt 323; the fourth synchronous pulley 220 is connected to the syringe shaft 210 of the syringe 200; the second bevel gear pair 322 is arranged relative to the first bevel gear pair 312, and their structures are basically the same, belonging to the common structures in the art, and will not be described in detail here.

[0067] Furthermore, the first transmission chain 310 and the second transmission chain 320 are manufactured using the same batch, group, and process steps, and assembled using the same method; specifically, as shown below... Figure 1As shown, the first transmission chain 310 includes a first synchronous belt 311, a first bevel gear pair 312, and a second synchronous belt 313; the second transmission chain 320 includes a third synchronous belt 321, a second bevel gear pair 322, and a fourth synchronous belt 323. The components of the synchronous belts, pulleys, and bevel gear pairs are all processed in the same batch, group, and step, and assembled using the same method. This allows the first transmission chain 310 and the second transmission chain 320 to be positioned at opposite ends of the servo motor 300. The first transmission chain 310 and the second transmission chain 320 are not symmetrically arranged; due to transmission requirements, they are staggered horizontally. The batch, group, and step processing of these components does not necessarily mean that the overall dimensions of each component are completely identical, but rather that they are processed under the same conditions and using the same method to achieve good consistency. The produced components of the first transmission chain 310 and the second transmission chain 320 can be completely identical, symmetrically structured, or have the same structural features, such as the first synchronous belt 311. The first synchronous pulley 302 and the second synchronous pulley 321 are processed in the same batch, group, and step. Their key parameters are the same, and only the final product length differs to accommodate different transmission pitches, but this does not affect synchronization. The structure and processing of the synchronous pulleys at corresponding positions can be completely identical, such as the synchronous pulley structures in the first synchronous pulley 302 and the second synchronous pulley 306, and the first bevel gear pair 312 and the second bevel gear pair 322. The third synchronous pulley 130 and the fourth synchronous pulley 220 are processed in the same batch, group, and step. Their outer synchronous tooth structures are completely identical, but due to the different dimensions of the needle disc shaft 110 and the needle cylinder shaft 210, the center hole dimensions of the third synchronous pulley 130 and the fourth synchronous pulley 220 are different. However, since the connection of the center holes is usually a fixed connection, the impact on synchronization can be ignored. Correspondingly, the first transmission chain 310 and the second transmission chain 320 can be symmetrically arranged to ensure that the dimensions of each component processed in the same batch, group, and step are the same or symmetrical.

[0068] In the system design, in order to ensure the rotation angle of the needle plate 100 (such as... Figure 1 Point A in the diagram corresponds to the angle of rotation of syringe 200 (e.g., point A in the diagram). Figure 1 Point B in the diagram uses a servo motor 300 to drive two transmission chains respectively; at the same time, the same transmission ratio is designed and used, so that the end effectors - needle disc and syringe - obtain the same position and rotation angle. The second gear 304 only adjusts the transmission direction, so that the needle disc and syringe have the same direction of rotation, and the macroscopic synchronization error is zero.

[0069] The gears, synchronous pulleys, and synchronous belts used in the design and use of the two transmission chains are manufactured using the "same batch, same group, same work step, and same assembly method." For example, the two sets of synchronous pulleys are precision machined together synchronously. Even if there are machining errors, after the two transmission chains are installed in the same way, the needle plate 100 and the needle cylinder 200 will each have an angular error, Δα. 针盘 ,Δα 针筒 ,but

[0070] Δα 针盘 -Δα 针筒 ≈0

[0071] or

[0072] |Δα 针盘 -Δα 针筒 |≈0

[0073] The synchronization error between the two can theoretically be considered to be zero.

[0074] The design employs a scheme that minimizes the spatial length of the transmission chain from servo motor 300 to the actuator needle plate 100 and from servo motor 300 to the actuator needle cylinder 200, while also minimizing the number of intermediate links (transmission pairs) in the rotating chain. This approach aims to reduce accumulated transmission errors and maximize the reliability of the transmission chain. By driving two transmission chains from the same power source—the servo motor—the design achieves a comprehensive optimization that balances both the same transmission ratio (ensuring minimal synchronization error—theoretically zero, although actual synchronization error remains small due to manufacturing and installation errors) and the minimum number of intermediate links.

[0075] Regarding the reliability of the transmission chain, for a series system (two series systems in this example), the reliability is the product of the reliability of each component that makes up the system:

[0076]

[0077] Therefore, this solution achieves the highest reliability while minimizing the synchronization error between the working states of the needle disc and the syringe.

[0078] In one embodiment of the present invention, a slip adjuster 120 is provided on the second synchronous belt 313; a position sensor 140 is provided on the needle plate 100; the slip adjuster 120 includes a micro motor 121 and a lead screw component 122 connected thereto; the lead screw component 122 is connected to an adjusting component; the adjusting component is clamped on the second synchronous belt 313 and its position does not change with the rotation of the second synchronous belt 313; the micro motor 121 controls the movement of the lead screw component 122 to adjust the distance between one side and the other side of the second synchronous belt 313, thereby changing the tension of the second synchronous belt 313; the adjusting component includes an adjusting frame 125; the two ends of the adjusting frame 125 are rotatably connected to an inner adjusting wheel 124 located inside the second synchronous belt 313 and an outer adjusting wheel 123 located outside the second synchronous belt 313, respectively; the inner adjusting wheel 124 is a synchronous belt pulley coupled to the second synchronous belt 313 for transmission.

[0079] Using the second rotating chain 320 as a reference, that is, the rotation angle and speed of the syringe 200 as a reference, the rotation angle and speed of the needle plate 100 are finely adjusted. Then, based on the near-zero synchronization error between the two, artificial intelligence technology is used to make the rotation angle and speed error between the two even closer to zero.

[0080] The specific implementation method is summarized as follows:

[0081] The position sensor 140 measures two corresponding points on the needle plate 100 and the syringe 200, such as... Figure 2 In the middle, A and B. Record the corner positions of both, which can be taken as a reference plane 400—the perpendicular line tangent to the frontmost needle plate 100-syringe cylinder 200, see... Figure 2 .

[0082] The measurement point B of syringe 200 is ΔB relative to the reference position 500; the measurement point A of needle disc 100 is -ΔA relative to the reference position; the positional difference between point A and point B—the synchronization error—is...

[0083] Δ = ΔB - (-ΔA) = ΔB + ΔA

[0084] Explanation: A lags behind B – needle plate 100 lags behind syringe 200; the rotation angle of needle plate 100 should be increased.

[0085] Δ = ΔB - (-ΔA) = ΔB + ΔA.

[0086] The rotation angle of the needle disc 100 is adjusted in real time by the slip regulator 120, thereby achieving synchronization between the needle disc 100 and the syringe 200. The slip regulator 120 is essentially a transmission fine adjuster, which can fine adjust the rotation angle of the needle disc 100 by adjusting the tension of the synchronous belt.

[0087] Tension adjustment, such as Figure 3As shown. At the equilibrium position, the tension of the second synchronous belt 313 is T0. When adjusted along the y-direction by the slip adjuster 120, the tension becomes T0 + ΔT, thus slightly increasing the pulley speed in the synchronous belt drive system. Conversely, when the synchronous belt tension is appropriately released, the pulley speed decreases slightly. The second synchronous belt 313 is fixedly connected to the needle plate 100, thereby enabling minute adjustments to the rotation angle of the needle plate 100. This minute adjustment of the tension of the second synchronous belt 313 is achieved by a minute displacement Δy in the vertical direction of the synchronous belt.

[0088] Set (determined experimentally) the equilibrium pressure value T0 of the tension regulating pressure sensor. In this state, the needle disc 100 and syringe 200 relative to the reference reference have...

[0089] ΔA = 0; ΔB = 0; Δ = 0

[0090] During the operation of the circular knitting machine, due to some accidental factor, Δ≠0, and the position sensor 140 sends a signal requiring fine-tuning. The micro motor 121 of the slip regulator 120 starts and drives the lead screw component 122 to run, driving the adjustment component to make a small displacement Δy in the y-direction. At this time, the tension of the second synchronous belt 313 is indicated by the pressure sensor as T0+ΔT. A pressure sensor is set on each of the inner and outer adjustment wheels to ensure that when fine-tuning is made in different directions, one sensor indicates the direction of movement and the maximum pressure value.

[0091] The adjusting component consists of two adjusting wheels, positioned on either side of the timing belt to be adjusted, forming a clamping effect on the timing belt. The outer adjusting wheel 123 has a spacer groove along its axial direction on its outer circumference; the spacer groove is a small, shallow groove formed on the working surface of the adjusting wheel. The synchronizing teeth on the inner adjusting wheel 124 are smaller than those on the third timing pulley 130. The overall shape of the working surface of the inner adjusting wheel 124 is similar to that of the timing pulley, but the protruding part (synchronizing teeth) is slightly smaller than that of the timing pulley, thus enabling a small relative displacement when adjusting the timing belt tension. This design and arrangement ensures precise adjustment of the timing belt while maintaining near-pure rolling between the timing belt and the adjusting wheels, minimizing friction.

[0092] According to the formula

[0093] Δ=kΔy

[0094] In the formula, k is the adjustment factor, which can be determined experimentally.

[0095] Δy—fine-tuning amount, calculated based on Δ measured by the position sensor, and then the fine-tuning amount is calculated. For fine adjustment, the lead screw assembly 122 employs an "ultra-small lead / diameter ratio lead screw mechanism" for adjustment.

[0096]

[0097] A single-ended lead screw is used.

[0098]

[0099] By analyzing minute rotation angles Δθ or minute arc lengths This allows for precise adjustment of Δy.

[0100]

[0101] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A transmission mechanism for a circular knitting machine with a theoretical synchronization error of zero between the needle disc and the needle cylinder, characterized in that: The device includes a needle plate (100) and a syringe (200) arranged opposite to each other; the needle plate (100) and the syringe (200) are driven to rotate by the same servo motor (300); the servo motor (300) is connected to the needle plate (100) through a first transmission chain (310); the servo motor (300) is connected to the syringe (200) through a second transmission chain (320); the first transmission chain (310) and the second transmission chain (320) have the same transmission ratio, thereby driving the needle plate (100) and the syringe (200) to rotate synchronously. The output shaft (301) of the servo motor (300) is provided with a first synchronous pulley (302) and a first gear (303); the first synchronous pulley (302) is connected to the needle plate (100) through a first transmission chain (310); the first gear (303) meshes with a second gear (304); the other end of the central shaft (305) of the second gear (304) is provided with a second synchronous pulley (306); the second synchronous pulley (306) is connected to the syringe (200) through a second transmission chain (320); the first synchronous pulley (302) and the second synchronous pulley (306) are the same size and have the same rotational speed; The first transmission chain (310) includes a first bevel gear pair (312); the two power transmission ends of the first bevel gear pair (312) are respectively connected to a first synchronous pulley (302) and a third synchronous pulley (130) via a first synchronous belt (311) and a second synchronous belt (313); the first synchronous pulley (302) is connected to the output shaft (301) of the servo motor (300); the third synchronous pulley (130) is connected to the needle disc rotating shaft (110) of the needle disc (100); The second transmission chain (320) includes a second bevel gear pair (322); the two power transmission ends of the second bevel gear pair (322) are respectively connected to the second synchronous pulley (306) and the fourth synchronous pulley (220) via the third synchronous belt (321) and the fourth synchronous belt (323); a second gear (304) is provided on the central shaft (305) of the second synchronous pulley (306); the second gear (304) meshes with the first gear (303) on the output shaft (301) of the servo motor (300); the fourth synchronous pulley (220) is connected to the syringe shaft (210) of the syringe (200).

2. The transmission mechanism for a circular knitting machine needle disc and needle cylinder with theoretically zero synchronization error according to claim 1, characterized in that: The needle plate (100) is provided with a position sensor (140) for collecting the synchronization error value between the needle plate (100) and the syringe (200); the second synchronization belt (313) is provided with a slip regulator (120) for adjusting the tension of the second synchronization belt (313) according to the synchronization error value to correct the rotation position of the needle plate (100) so that the needle plate (100) and the syringe (200) rotate synchronously.

3. The transmission mechanism for a circular knitting machine needle disc and needle cylinder with theoretically zero synchronization error according to claim 2, characterized in that: The slip regulator (120) includes a micro motor (121) and a lead screw component (122) connected thereto; the lead screw component (122) is connected to an adjustment component; the adjustment component is clamped on the second synchronous belt (313) and its position does not change with the rotation of the second synchronous belt (313); the micro motor (121) controls the movement of the lead screw component (122) to adjust the distance between one side and the other side of the second synchronous belt (313) to change the tension of the second synchronous belt (313).

4. The transmission mechanism for a circular knitting machine needle disc and needle cylinder with theoretically zero synchronization error according to claim 3, characterized in that: The adjusting component includes an adjusting frame (125); the two ends of the adjusting frame (125) are rotatably connected to an inner adjusting wheel (124) located inside the second synchronous belt (313) and an outer adjusting wheel (123) located outside the second synchronous belt (313); the inner adjusting wheel (124) is a synchronous belt pulley that is coupled and driven with the second synchronous belt (313).

5. The transmission mechanism for a circular knitting machine needle disc and needle cylinder with theoretically zero synchronization error according to claim 4, characterized in that: The outer adjusting wheel (123) has a spaced groove along its axial direction on its outer periphery; the synchronous tooth size on the inner adjusting wheel (124) is smaller than the synchronous tooth size on the third synchronous belt pulley (130); the adjusting frame (125) is provided with a first pressure sensor (126) for monitoring the pressure of the inner adjusting wheel (124) and a second pressure sensor (127) for monitoring the pressure of the outer adjusting wheel (123).

6. The transmission mechanism for a circular knitting machine needle disc and needle cylinder with theoretically zero synchronization error according to claim 1, characterized in that: The transmission ratio between the first gear (303) and the second gear (304) is 1.

7. The transmission mechanism for a circular knitting machine needle disc and needle cylinder with theoretically zero synchronization error according to claim 1, characterized in that: The first transmission chain (310) and the second transmission chain (320) are manufactured in the same batch, group, and step, and are assembled using the same method.

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