Yarn feeder

Abstract

A yarn feeder comprises a support and a yarn feeding mechanism arranged on the support, a yarn adjusting mechanism matched with the yarn feeding mechanism is arranged on the support, a tension measuring mechanism used for measuring yarn tension is arranged on the support, and the tension measuring mechanism is arranged between the yarn feeding mechanism and the yarn adjusting mechanism. Yarns sequentially penetrate through the yarn feeding mechanism, the tension measuring mechanism and the yarn adjusting mechanism. Compared with the prior art, the tension of the yarn is borne through the ceramic rod, the swing piece connected with the ceramic rod moves under the action of the tension of the yarn, the displacement variation of the swing piece is detected under the action of the sensing element, and the specific numerical value of the tension of the yarn is calculated according to the displacement variation. Therefore, the yarn adjusting mechanism can accurately control the swing angle, the yarn adjusting mechanism can rapidly and accurately adjust the swing angle when the yarn feeder replaces the yarn, the yarn feeding efficiency is improved, and the yarn feeding work of different kinds of yarn is met.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, specifically to a yarn feeder. Background Technology

[0002] The yarn feeder is a key component in textile machinery (such as circular knitting machines, hosiery machines, warp knitting machines, etc.). It is mainly used to precisely control the yarn feeding speed and tension to ensure that the yarn is supplied evenly and stably to the knitting needles or hooks during the knitting process.

[0003] Most yarn feeders currently use a drive wheel and a driven wheel to transport yarn. The main motor speed is adjustable, and the length of the transported yarn is measured by the number of rotations of the motor. In addition, there is a special tension motor that drives a swing rod to swing back and forth to tighten and loosen the yarn in order to adjust the tension of the transported yarn.

[0004] Chinese Patent Application No. 202010962860.9 discloses a constant tension yarn feeder. The disclosed yarn feeder includes a microcontroller control circuit, a rotary encoder, a first magnet, a motor for feeding yarn, a motor drive control circuit, a display screen, a tension setting circuit, a power supply circuit, and a yarn tension detection device. The yarn tension detection device includes a base, a lever mounted on the base, a second magnet, a spring, and a Hall sensor. The Hall sensor detects the yarn tension and pressure of the fed yarn in real time and sends the data to the microcontroller control circuit. The rotary encoder divides the 360° rotation of the motor shaft into 4096 parts, accurately identifying the rotation angle of the motor shaft and the real-time position of the motor rotor by sensing the first magnet, and sending this data to the motor drive control circuit. The microcontroller control circuit, through the motor drive control circuit, controls the speed of the motor to adjust the yarn tension. Chinese Patent Application No. 201920158076.5 discloses a yarn tension control device for a yarn feeder. The disclosed yarn tension control device includes a yarn feeder body with a yarn feeding disc on it, and a tension control device disposed on the side of the yarn feeding disc. The tension control device is disposed on the yarn feeder body and includes an adjusting motor, a transmission shaft, an adjusting rod, and a tension wheel. The other end of the transmission shaft is connected to one end of the adjusting rod. The adjusting rod and the transmission shaft are arranged perpendicular to each other. The tension wheel is disposed on the other end of the adjusting rod. A backstop mechanism is also provided on the transmission shaft. A connecting body is provided between the transmission shaft and the adjusting rod.

[0005] In the aforementioned prior art, the yarn feeder detects the yarn tension using a yarn tension detection device and adjusts the yarn feeding speed using a microcontroller control circuit to maintain constant yarn tension. However, in actual production, there are many types of yarn with varying thicknesses and, in particular, significant differences in elasticity. Therefore, the angle of the yarn feeder's swing arm needs constant adjustment, but the adjustment value cannot be known in advance. Especially when replacing new yarn, the value can only be determined by testing the actual yarn on the machine for an extended period, thus reducing work efficiency. Utility Model Content

[0006] The present invention aims to overcome the defects in the prior art and provide a yarn feeder that can detect the tension of the yarn in real time, thereby accurately controlling the swing angle of the swing arm according to the tension and ensuring that the yarn reaches the set tension value.

[0007] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a yarn feeder, comprising a support and a yarn feeding mechanism disposed on the support, a yarn adjusting mechanism cooperating with the yarn feeding mechanism on the support, and a tension measuring mechanism for measuring the yarn tension on the support, the tension measuring mechanism being disposed between the yarn feeding mechanism and the yarn adjusting mechanism, the yarn passing through the yarn feeding mechanism, the tension measuring mechanism and the yarn adjusting mechanism in sequence; the tension measuring mechanism includes a ceramic rod bearing the yarn tension and a swinging component connected to the ceramic rod, the swinging component being provided with a sensing element for detecting the displacement change of the swinging component.

[0008] As a preferred embodiment of this utility model, the yarn feeding mechanism includes a synchronously rotating driving wheel and a driven wheel, and a drive motor for driving the driving wheel to rotate is provided on the bracket, and the yarn passes through the driving wheel and the driven wheel in sequence.

[0009] As a preferred embodiment of this utility model, the driving wheel is provided with a driving gear, and the driven wheel is provided with a driven gear that meshes with the driving gear.

[0010] As a preferred embodiment of this utility model, a guide plate for guiding yarn feeding is provided above the drive wheel, and a yarn guide ring for the yarn to pass through is formed on the guide plate.

[0011] As a preferred embodiment of this utility model, the swinging member is connected to a spring sheet, and the tail end of the ceramic rod is provided with a sensor connected to the spring sheet, with the sensing element suspended on the sensor.

[0012] As a preferred embodiment of this utility model, the tail end of the ceramic rod is provided with a base connected to the spring sheet, the sensor is disposed in the base, and the sensing element is located on one side of the base.

[0013] As a preferred embodiment of the present invention, the tension measuring mechanism further includes a base for fixing the swinging component, a vertically downward limiting shaft on the base, a bushing directly below the base, and the lower end of the limiting shaft suspended inside the bushing.

[0014] As a preferred embodiment of this utility model, an auxiliary yarn guide wheel for adjusting the yarn position is provided between the tension measuring mechanism and the yarn adjusting mechanism.

[0015] As a preferred embodiment of this utility model, the yarn adjusting mechanism includes a swing arm and an adjusting motor for driving the swing arm to swing, and the end of the swing arm is provided with a connecting ring for connecting the yarn.

[0016] As a preferred embodiment of this utility model, the adjusting motor is equipped with an angle sensor for monitoring the swing angle of the swing arm.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The yarn is fed through the yarn feeding mechanism, and the tension of the yarn is detected by the tension measuring mechanism. The tension of the yarn is borne by a ceramic rod, and the oscillating part connected to the ceramic rod moves under the action of the yarn tension. The displacement change of the oscillating part is detected by the sensing element, and the specific value of the yarn tension is calculated based on the displacement change. This allows the yarn adjustment mechanism to accurately control the oscillation angle. When the yarn feeder changes yarn, the yarn adjustment mechanism can quickly and accurately adjust the oscillation angle, thereby improving the yarn feeding efficiency and meeting the needs of feeding different types of yarn.

[0019] 2. Furthermore, a spring is provided on the swing component, and a sensor connected to the spring is provided at the tail end of the ceramic rod. The sensing element is suspended on the sensor. The ceramic rod achieves multi-point elastic support through the spring, so that when the ceramic rod is displaced by the force applied by the yarn, the ceramic rod always maintains a horizontal posture. The displacement change of the sensor more directly reflects the change of yarn tension, improving the accuracy of yarn tension detection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the tension measuring mechanism of this utility model;

[0022] Figure 3 This is a cross-sectional view of the tension measuring mechanism of this utility model.

[0023] Reference numerals: 1. Yarn feeding mechanism; 101. Driving wheel; 1011. Driven gear; 102. Driven gear; 1021. Drive motor; 103. Bracket; 2. Guide plate; 3. Yarn guide ring; 301. Yarn adjusting mechanism; 4. Adjusting motor; 401. Swing rod; 402. Connecting ring; 4021. Angle sensor; 403. Tension measuring mechanism; 5. Ceramic rod; 501. Sensor; 5011. Base; 5012. Limiting shaft; 5013. Swinging component; 502. Spring; 5021. Sensing element; 503. Base; 504. Bushing; 5041. Main control board; 505. Auxiliary yarn guide wheel; 6. Yarn; 7. Detailed Implementation

[0024] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] like Figures 1-3 As shown, a yarn feeder includes a support 2 and a yarn feeding mechanism 1 disposed on the support 2. The support 2 is provided with a yarn adjusting mechanism 4 that cooperates with the yarn feeding mechanism 1. The support 2 is also provided with a tension measuring mechanism 5 for measuring the tension of yarn 7. The tension measuring mechanism 5 is disposed between the yarn feeding mechanism 1 and the yarn adjusting mechanism 4. The yarn 7 passes through the yarn feeding mechanism 1, the tension measuring mechanism 5 and the yarn adjusting mechanism 4 in sequence. The tension measuring mechanism 5 includes a ceramic rod 501 that bears the tension of the yarn 7 and a swinging element 502 connected to the ceramic rod 501. The swinging element 502 is provided with a sensing element 503 for detecting the displacement change of the swinging element 502.

[0026] Furthermore, the yarn feeding mechanism 1 is located at the top of the support 2, and the yarn 7 is fed through the yarn feeding mechanism 1. When the yarn 7 enters the tension measuring mechanism 5, the tension value of the yarn 7 is measured under the action of the tension measuring mechanism 5, so that the yarn adjusting mechanism 4 can quickly and accurately adjust the yarn 7 to the appropriate position, thereby ensuring that the tension of the yarn 7 meets the set requirements and meets the adjustment requirements for different types of yarn 7, thus improving the yarn feeding speed. In addition, the yarn feeder is also equipped with a control system, which is electrically connected to the yarn feeding mechanism 1, the yarn adjusting mechanism 4 and the tension measuring mechanism 5. The tension measuring mechanism 5 feeds back the tension value of the yarn 7 to the control system, and the control system controls the yarn adjusting mechanism 4 to adjust the tension of the yarn 7.

[0027] The yarn feeding mechanism 1 includes a synchronously rotating drive wheel 101 and a driven wheel 102. The support 2 is equipped with a drive motor 103 that drives the drive wheel 101 to rotate. The yarn 7 passes through the drive wheel 101 and the driven wheel 102 in sequence. Furthermore, the drive motor 103 is a servo motor with a magnetic braid at the tail. The length of the conveyed yarn can be obtained by recording the number of rotations of the motor. The circumferential surfaces of the drive wheel 101 and the driven wheel 102 are tightly fitted to press the yarn 7, thereby realizing the conveying of the yarn 7.

[0028] The driving wheel 101 is provided with a driving gear 1011, and the driven wheel 102 is provided with a driven gear 1021 that meshes with the driving gear 1011. Furthermore, the driving wheel 101 is connected to the output end of the drive motor 103, and the driven wheel 102 is rotatably mounted on the bracket 2. The driven wheel 102 meshes with the driving gear 1011 on the driving wheel 101 through the driven gear 1021 to achieve synchronous rotation with the driving wheel 101, thereby realizing the conveying of the yarn 7.

[0029] Above the drive wheel 101 is a guide plate 3 for guiding the yarn 7. A guide ring 301 for the yarn 7 to pass through is formed on the guide plate 3. Furthermore, the guide plate 3 is mounted on the bracket 2, and the guide ring 301 is mounted on the guide plate 3 and passes through the guide plate 3. The yarn 7 passes through the guide ring 301, and the guide ring 301 guides the yarn 7, thereby ensuring that the yarn 7 enters the yarn feeding mechanism 1 smoothly and avoiding the situation of the yarn 7 getting tangled.

[0030] A spring sheet 5021 is connected to the swing member 502. A sensor 5011 connected to the spring sheet 5021 is provided at the tail end of the ceramic rod 501. The sensing element 503 is suspended on the sensor 5011. Furthermore, during the yarn feeding process, the yarn 7 should be in a taut state. Correspondingly, the taut yarn 7 presses down on the ceramic rod 501 so that the spring sheet 5021 is always in an elastic deformation state. At this time, the ceramic rod 501 displaces downward. The amount of displacement represents the real-time tension of the yarn 7.

[0031] In addition, an inductor 5011 is mounted at the end of the ceramic rod 501, and a sensing element 503 is set to detect the displacement change of the inductor 5011. It can be seen that the specific value of the yarn tension 7 is calculated based on the detection data.

[0032] Specifically, the sensor 5011 can be a magnet, and the sensing element 503 can be a Hall element. The Hall element is set in correspondence with the magnet so that the Hall element can detect the displacement change of the magnet.

[0033] Meanwhile, a main control board 505 is also provided, on which Hall elements are mounted. The main control board 505 calculates the specific value of the yarn tension 7 based on the detection data of the Hall elements. The main control board 505 is electrically connected to the control system.

[0034] The ceramic rod 501 has a base 5012 at its tail end that is connected to the spring piece 5021. The sensor 5011 is disposed in the base 5012, and the sensing element 503 is located on one side of the base 5012.

[0035] Multiple springs 5021 can be provided, and the multiple springs 5021 are arranged in parallel. The multiple springs 5021 together connect the base 5012 and the swing member 502. While ensuring elasticity in the vertical direction, they limit the possible deflection in the horizontal direction, so that when the ceramic rod 501 is subjected to force at one end, it can still generate displacement in a horizontal posture, that is, it can move up and down in the vertical direction. The sensor 5011 moves along with the ceramic rod 501 and generates displacement. Under the action of the sensing element 503, the displacement is detected.

[0036] The tension measuring mechanism 5 also includes a base 504 for fixing the swing member 502. A vertically downward limiting shaft 5013 is provided on the base 5012. A bushing 5041 is provided directly below the base 5012 on the base 504. The lower end of the limiting shaft 5013 is suspended in the bushing 5041. Furthermore, the base 504 is mounted on the bracket 2. A connecting hole 5042 is provided on the base 504. The bushing 5041 is disposed in the connecting hole 5042. The inner diameter of the bushing 5041 is larger than the diameter of the limiting shaft 5013. The limiting shaft 5013 is suspended in the bushing 5041. A certain elastic gap is left between the bottom end of the base 5012 and the top end of the bushing 5041. By setting this elastic gap, the limiting shaft 5013 can have displacement space, and the bushing 5041 guides and limits the up and down movement of the limiting shaft 5013.

[0037] The base 5012 is located at the end of the spring 5021. When the spring 5021 undergoes elastic deformation, the base 5012 may generate an arc-shaped displacement trajectory. Therefore, the inner diameter of the bushing 5041 should reserve enough space so that the limiting shaft 5013 does not contact the inner wall of the bushing 5041 during the guiding process, and the external force applied by the yarn 7 to the ceramic rod 501 is not canceled by other forces, so that the displacement change remains pure and the detection accuracy is ensured.

[0038] During operation, the yarn 7 rests on the circumferential surface of the ceramic rod 501. The yarn 7 applies a downward force to the ceramic rod 501, causing the ceramic rod 501 to move downward along the base 5012 under the guidance of the limiting shaft 5013. The sensor 5011 on the base 5012 also experiences a downward displacement relative to the detection surface of the sensing element 503. The magnitude of the force applied by the yarn 7 determines the distance of movement. When the force applied by the yarn 7 decreases or is removed, the base 5012 and the sensor 5011 return to their original positions under the action of the spring piece 5021.

[0039] An auxiliary yarn guide wheel 6 is provided between the tension measuring mechanism 5 and the yarn adjusting mechanism 4 to adjust the position of the yarn 7. Furthermore, the position of the yarn 7 coming out of the tension measuring mechanism 5 is adjusted by the auxiliary yarn guide wheel 6, thereby ensuring that the yarn 7 can accurately enter the yarn adjusting mechanism 4 and ensuring that the yarn 7 will not get tangled during the conveying process.

[0040] The yarn adjustment mechanism 4 includes a swing arm 402 and an adjustment motor 401 that drives the swing arm 402 to swing. The end of the swing arm 402 is provided with a connecting ring 4021 for connecting the yarn 7. Furthermore, the adjustment motor 401 is mounted on the bracket 2 and is electrically connected to the control system. The swing angle of the swing arm 402 is controlled by the tension of the yarn 7 measured by the tension measuring mechanism 5, thereby adjusting the tension of the yarn 7 and ensuring that the tension of the yarn 7 meets the set requirements. The connecting ring 4021 is located at the end of the swing arm 402. By swinging the swing arm 402, the position of the connecting ring 4021 is adjusted, and the yarn 7 passes through the connecting ring 4021, thereby realizing the adjustment of the tension of the yarn 7.

[0041] The adjusting motor 401 is equipped with an angle sensor 403 for monitoring the swing angle of the swing arm 402. Furthermore, the angle sensor 403 monitors the angle adjustment of the swing arm 402, thereby ensuring that the angle of the swing arm 402 meets the set requirements.

[0042] Yarn 7 enters through the guide ring 301, passes through the drive wheel 101 and the driven wheel 102, then through the tension measuring mechanism 5, through the auxiliary yarn wheel 6, and finally exits through the connecting ring 4021 on the swing arm 402. The adjusting motor 401 adjusts the up-and-down swing angle of the swing arm 402 at any time to adjust the tension of the output yarn 7. The tension measuring mechanism 5 can measure the real-time tension value of the conveyed yarn 7 and feed it back to the control system of the yarn feeder. The control system will adjust the angle of the swing arm 402 of the adjusting motor 401 to achieve the required tension value. The circumferential surfaces of the drive wheel 101 and the driven wheel 102 are tightly fitted to press the yarn 7, thereby conveying the yarn 7. The drive motor 103 is a servo motor with a magnetic braid at the tail, and the length of the conveyed yarn 7 can be obtained by recording the number of rotations of the motor.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0044] Although this document frequently uses reference numerals from the accompanying drawings, such as: yarn feeding mechanism 1, driving wheel 101, drive gear 1011, driven wheel 102, driven gear 1021, drive motor 103, bracket 2, guide plate 3, yarn guide ring 301, yarn adjusting mechanism 4, adjusting motor 401, swing rod 402, connecting ring 4021, angle sensor 403, tension measuring mechanism 5, ceramic rod 501, sensor 5011, base 5012, limiting shaft 5013, swinging component 502, spring 5021, sensing element 503, base 504, bushing 5041, main control board 505, auxiliary yarn guide wheel 6, yarn 7, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A yarn feeder, comprising a support (2) and a yarn feeding mechanism (1) disposed on the support (2), wherein the support (2) is provided with a yarn adjusting mechanism (4) cooperating with the yarn feeding mechanism (1), characterized in that, The bracket (2) is provided with a tension measuring mechanism (5) for measuring the tension of the yarn (7). The tension measuring mechanism (5) is located between the yarn feeding mechanism (1) and the yarn adjusting mechanism (4). The yarn (7) passes through the yarn feeding mechanism (1), the tension measuring mechanism (5) and the yarn adjusting mechanism (4) in sequence. The tension measuring mechanism (5) includes a ceramic rod (501) that bears the tension of the yarn (7) and a swinging component (502) that connects to the ceramic rod (501). The swinging component (502) is provided with a sensing element (503) that detects the displacement change of the swinging component (502).

2. A yarn feeder according to claim 1, characterized in that The yarn feeding mechanism (1) includes a synchronously rotating drive wheel (101) and a driven wheel (102). The bracket (2) is equipped with a drive motor (103) that drives the drive wheel (101) to rotate. The yarn (7) passes through the drive wheel (101) and the driven wheel (102) in sequence.

3. A yarn feeder according to claim 2, wherein The driving wheel (101) is provided with a driving gear (1011), and the driven wheel (102) is provided with a driven gear (1021) that meshes with the driving gear (1011).

4. A yarn feeder according to claim 2, wherein Above the drive wheel (101) is a guide plate (3) for guiding the yarn (7) to feed, and a guide ring (301) for the yarn (7) to pass through is formed on the guide plate (3).

5. A yarn feeder according to claim 1, wherein The swing member (502) is connected to a spring piece (5021), and the end of the ceramic rod (501) is provided with a sensor (5011) connected to the spring piece (5021). The sensing element (503) is suspended on the sensor (5011).

6. A yarn feeder according to claim 5, wherein The ceramic rod (501) has a base (5012) at its tail end that is connected to the spring piece (5021), the sensor (5011) is disposed in the base (5012), and the sensing element (503) is located on one side of the base (5012).

7. A yarn feeder according to claim 6, wherein The tension measuring mechanism (5) also includes a base (504) for fixing the swing member (502). The base (5012) is provided with a vertically downward limiting shaft (5013). The base (504) is provided with a bushing (5041) directly below the base (5012). The lower end of the limiting shaft (5013) is suspended in the bushing (5041).

8. A yarn feeder according to claim 1, wherein An auxiliary yarn guide wheel (6) for adjusting the position of the yarn (7) is provided between the tension measuring mechanism (5) and the yarn adjusting mechanism (4).

9. A yarn feeder according to claim 1, wherein The yarn adjustment mechanism (4) includes a swing arm (402) and an adjustment motor (401) that drives the swing arm (402) to swing. The end of the swing arm (402) is provided with a connecting ring (4021) for connecting the yarn (7).

10. A yarn feeder according to claim 9, wherein The regulating motor (401) is equipped with an angle sensor (403) for monitoring the swing angle of the swing arm (402).

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