A warp knitting machine let-off device and a warp knitting machine

Abstract

The present invention relates to the technical field of warp knitting machines, and discloses a warp feeding device for a warp knitting machine and a warp knitting machine. The warp feeding device for the warp knitting machine includes a plurality of warp feeding rollers, and the warp feeding rollers are respectively used for feeding warp for a knitting device. The warp feeding rollers are respectively connected with driving motors, and the driving motors drive the corresponding warp feeding rollers to rotate, so that the rotation speed of each warp feeding roller is controllable. The present invention is provided with a plurality of warp feeding rollers, and the plurality of warp feeding rollers are respectively connected with driving motors. The driving motors respectively drive different warp feeding rollers to perform active warp feeding. And because each warp feeding roller is driven by an independent driving motor, different warp feeding rollers can supply warp at different speeds, so that the transmission amount and tension of each warp yarn can be accurately controlled, greatly improving the transmission accuracy of the warp yarn and the warp knitting quality. Moreover, in the above technical solution, each warp feeding roller adopts an active warp feeding mode, with a compact structure, small occupied space, and high space utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of warp knitting machines, and particularly to a warp feeding device and a control method for a warp knitting machine. Background Art

[0002] Knitting can be divided into warp knitting and weft knitting. Among them, warp knitting is to form loops in sequence along the longitudinal direction (warp direction) of the fabric surface with multiple yarns simultaneously, while weft knitting forms loops in sequence along the transverse direction (weft direction) of the fabric with one or more yarns. As the name implies, a warp knitting machine is a knitting device used for warp knitting. During the operation of a warp knitting machine, warp feeding needs to be continuously carried out. Warp feeding refers to the process in which when the warp knitting machine is running normally, the warp yarns are unwound from the warp beam and fed into the looping system according to a certain warp feeding amount for the looping parts to carry out knitting.

[0003] Existing warp knitting machines mainly adopt the form of active yarn feeding driven by a warp beam driving a bobbin head, or passive yarn feeding using a yarn stand. As Figure 1 shown, among them, in the active yarn feeding method, multiple warp yarns are actively fed by the same bobbin head 11, so that the warp feeding speeds of the multiple warp yarns are the same. And usually, multiple bobbin heads 11 are fed by the same driving motor 12, and the rotational speed of the bobbin head 11 is relatively fixed. Therefore, it cannot meet the different requirements for warp feeding amount and density when knitting different products, and the types of products are limited. While the passive yarn feeding method using a yarn stand is to directly pull the warp beam to rotate for warp feeding by the warp yarn tension. In this warp feeding form, due to the large rotational inertia of the warp beam, it will cause large fluctuations in the warp yarn tension, and it cannot be effectively braked during high-speed operation, thus affecting the warp knitting quality. And due to different requirements for warp feeding amount and tension, the overall machine structure is scattered, the floor area is large, the yarn feeding length is large, and the space utilization rate is low. Summary of the Invention

[0004] Therefore, it is necessary to provide a warp feeding device for a warp knitting machine to solve the technical problems that the warp tension of the existing warp feeding device fluctuates greatly and the warp feeding speeds of different warp yarns are fixed, affecting the warp knitting quality.

[0005] To achieve the above object, the inventor provides a warp feeding device for a warp knitting machine, including a plurality of warp feeding rollers, the warp feeding rollers are respectively used for feeding warp yarns to a knitting device, the warp feeding rollers are respectively connected with driving motors, and the driving motors drive the corresponding warp feeding rollers to rotate so that the rotational speed of each warp feeding roller is controllable.

[0006] Furthermore, it further includes a plurality of tension rods, the tension rods are correspondingly arranged at the front end of the warp yarn conveying direction of the warp feeding rollers, the warp yarns are conveyed forward in the conveying direction through the tension rods, and the tension rods are used for adjusting the tension of the warp yarns.

[0007] Furthermore, it further includes a tension adjusting motor, the tension adjusting motor is connected with the tension rod and is used for adjusting the position of the tension rod relative to the warp yarn to adjust the tension of the warp yarn.

[0008] Furthermore, it also includes a tension detection sensor, which is arranged on the warp yarn transmission path and is used to detect the tension of the warp yarn;

[0009] The tension regulating motor adjusts the tension rod according to the detected warp tension, so that the warp tension is constant within a preset range.

[0010] Furthermore, the plurality of let-off rollers are axially rotatably arranged on the panel, the drive motor is arranged on the back side of the panel opposite to the corresponding let-off rollers, and the drive motor is transmission-connected to the let-off rollers via a gear set.

[0011] Furthermore, the warp feed roller includes a first roller body and a second roller body, the gear set includes a first gear, a second gear and a third gear, the rotating shaft of the drive motor is provided with the first gear, the second gear and the third gear are respectively connected to the first roller body and the second roller body, the first gear is engaged with the second gear, the second gear is engaged with the third gear, the roller surfaces of the first roller body and the second roller body are tangent, the warp yarn enters the first roller body from the first tangential direction and passes around the roller surface of the first roller body, passes between the first roller body and the second roller body, and then extends out from the second tangential direction around the roller surface of the second roller body.

[0012] In order to solve the above technical problems, the present invention also provides another technical solution:

[0013] A warp knitting machine includes a warp feeding device and a knitting device, wherein the warp feeding device is used to transmit warp yarn to the knitting device, and the knitting device includes knitting needles and a main shaft for driving the knitting needles. It is characterized in that the warp feeding device is the warp knitting machine warp feeding device described in any of the above technical solutions.

[0014] Furthermore, the warp knitting machine controls the knitting device and the warp let-off device to work in coordination according to the pattern data corresponding to the knitting pattern, so that the warp let-off length of each warp let-off roller is adapted to the warp yarn usage of the corresponding knitting needle.

[0015] Furthermore, the main shaft is provided with an encoder for recording the position of the main shaft. The drive motor of the yarn supply roller uses the pulse signal output by the encoder as a synchronization signal to control the synchronous rotation of the warp let-off roller, so that the warp let-off length of the warp let-off roller is adapted to the warp yarn usage of the corresponding knitting needles.

[0016] Furthermore, the warp knitting machine divides a loop forming cycle of the main shaft into a plurality of equal parts, and in each equal part, the warp let-off roller performs a warp yarn conveying action.

[0017] Different from the prior art, the above technical solution is provided with a plurality of warp beams, and each of the plurality of warp beams is connected to a driving motor. The driving motors are respectively used to drive different warp beams for active warp feeding. Since each warp beam is driven by an independent driving motor, different warp beams can supply warp at different speeds, so that the transmission amount and tension of each warp yarn can be accurately controlled, greatly improving the transmission accuracy of the warp yarn and the warp knitting quality. Moreover, in the above technical solution, each warp beam adopts an active warp feeding method, with a compact structure, small occupied space, and high space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 6 is a schematic structural diagram of the active yarn feeding method of the warp knitting machine described in the background art;

[0019] Figure 2 FIG. 10 is a schematic structural diagram of the warp knitting machine described in the specific embodiment;

[0020] Figure 3 For Figure 2 an enlarged view of part A (i.e., the warp beam and the driving motor) in FIG. 10;

[0021] Figure 4 FIG. 20 is a schematic structural diagram of the warp beam described in the specific embodiment;

[0022] Figure 5 FIG. 24 is a schematic connection diagram of the tension adjusting motor and the tension rod;

[0023] Figure 6 FIG. 28 is a structural diagram of the tension adjusting mechanism;

[0024] Figure 7 FIG. 32 is a control module diagram of the warp knitting machine described in the specific embodiment;

[0025] Figure 8 FIG. 36 is a warp yarn tension control module diagram of the warp knitting machine described in the specific embodiment; Description of the reference numerals:

[0026] 1. Warp feeding device;

[0027] 11. Bobbin head;

[0028] 12. Driving motor;

[0029] 13. Mounting frame;

[0030] 14. Warp yarn driving array;

[0031] 140. Warp beam;

[0032] 141. Driving motor;

[0033] 142. First roller body;

[0034] 143. Second roller body;

[0035] 144. Installation panel;

[0036] 15. Tension rod;

[0037] 151. Driving rod;

[0038] 152. Driven rod;

[0039] 153. Traction motor;

[0040] 154. Adjusting seat

[0041] 2. Knitting device;

[0042] 21. Knitting needle; Detailed implementation mode

[0043] To describe in detail the technical content, structural features, achieved objectives and effects of the technical solution, the following will be described in detail with specific embodiments in conjunction with the accompanying drawings.

[0044] Please refer to Figures 2 to 8 , this embodiment provides a warp knitting machine. As Figure 2 shown, the warp knitting machine includes a warp feeding device 1 and a knitting device 2. Among them, the warp feeding device 1 is used to convey warp yarns to the knitting device 2, and the warp yarns are woven into warp knitted fabrics by the knitting device 2. As Figure 2 shown, the warp feeding device 1 of the warp knitting machine at least includes an installation frame 13 and a warp yarn driving array 14. The installation frame can be fixedly connected by a cross bar and a vertical rod. A plurality of warp yarn driving arrays 14 are arranged on the installation frame 13, and a warp feeding roller 140 is arranged on each warp yarn driving 14. The warp yarns are driven by the warp feeding roller 140 and conveyed to the knitting device 2. The knitting device includes knitting needles and a main shaft for driving the knitting needles to work. The main shaft drives the knitting needles to reciprocate up and down to weave the warp yarns into warp knitted fabrics. A tension rod can be arranged in front of the warp feeding roller 140 in the warp yarn conveying direction. The tension rod is used to adjust the tension of the warp yarns to ensure a constant tension during the warp yarn conveying process. The yarns are transmitted to the tension rod 150 of the knitting device through the tension rod, and finally guided to the knitting needles 21 through a yarn guide, and are woven into warp knitted fabrics by the knitting needles.

[0045] As Figure 3 shown is Figure 2Partial enlarged view of part A, that is, the specific structure of the warp beam 140 is shown in the screenshot. Among them, each warp beam 140 is respectively provided with a driving motor 141, and the warp beam 140 is driven to rotate by the driving motor 140. The warp yarn contacts the roller surface of the warp beam 140 and is driven by the warp beam 140 to be transmitted to the knitting device. In this embodiment, a warp beam 140 is provided for each warp yarn, and each warp beam 140 is respectively driven to rotate by a separately provided driving motor 141, so that the rotation speed of each warp beam 140 is independent, thereby accurately controlling the transmission speed of each warp yarn and greatly improving the transmission accuracy of the warp yarn.

[0046] As Figure 3 shown, the plurality of warp beams 140 are rotatably arranged axially on one surface (i.e., the front surface) of the panel 144, and the driving motor 141 is arranged on the other surface (i.e., the back surface) of the panel opposite to the corresponding warp beam 140. The rotating shaft of the driving motor 141 passes through the panel 144 and is in transmission connection with the warp beam 140, thereby driving the warp beam 140 to rotate. In this embodiment, setting the driving motor 141 on the back surface of the panel 144 and setting the warp beam 140 on the front surface of the panel 144 can make the volume of the warp yarn driving array smaller and the structure more compact, and more warp beams 140 can be arranged per unit area. Further, in this embodiment, the driving motor 141 can be in transmission connection with the warp beam 140 through a gear set. The rotation accuracy of the warp beam 140 can be ensured by the meshing transmission of the gear set. In other embodiments, other transmission structures such as belt transmission and chain transmission can also be used.

[0047] As Figure 3 and Figure 4 shown, in order to reduce the relative sliding between the warp yarn and the warp beam 140 and improve the transmission accuracy of the warp yarn, in this embodiment, the warp beam 140 adopts a structure of opposing rollers, that is, the warp beam 140 includes a first roller body 142 and a second roller body 143, and the transmission of one warp yarn is realized by the cooperation of the first roller body 142 and the second roller body 143. Specifically, the first roller body 142 and the second roller body 143 are arranged oppositely, and the roller surfaces of the first roller body 142 and the second roller body 143 are in contact with each other (i.e., in contact with each other). The warp yarn passes between the first roller body 142 and the second roller body 143 and is transmitted forward under the joint action of the first roller body 142 and the second roller body 143. As Figure 4As shown, the roller surfaces of the first roller body 142 and the second roller body 143 are tangent to each other. The warp yarn 100 enters the first roller body from the first tangent direction, passes around the roller surface of the first roller body between the first roller body and the second roller body, and then extends out from the second tangent direction around the roller surface of the second roller body. Among them, the extension directions of the first tangent direction and the second tangent direction intersect (i.e., are not parallel to each other). In this embodiment, the form of using a pair of rollers for the warp supply roller can greatly increase the friction between the warp yarn and the roller surface and improve the warp yarn transmission accuracy. Of course, in other embodiments, the warp supply roller 140 can also adopt a single roller body structure.

[0048] Furthermore, in this embodiment, the gear set for driving the warp supply roller to rotate includes a first gear, a second gear, and a third gear. The rotating shaft of the driving motor is provided with the first gear. The second gear and the third gear are respectively connected to the first roller body and the second roller body. The first gear meshes with the second gear, and the second gear meshes with the third gear. Therefore, the driving motor 141 can drive the first roller body and the second roller body to rotate simultaneously through the first gear, the second gear, and the third gear. And the number of teeth and the diameter of the second gear can be the same as those of the third gear, so as to ensure that the first roller body and the second roller body rotate at the same speed.

[0049] As Figure 5 and Figure 6 shown, in one embodiment, the tension rod 15 includes a driving rod 151, a driven rod 152, a tension adjustment motor 153, and an adjustment seat 154. The tension adjustment motor 153 is connected to the driving rod 151. The driving rod 151 and the driven rod 152 are oppositely arranged on the adjustment seat 154. The warp yarn passes between the driving rod 151 and the driven rod 152. The tension of the warp yarn is adjusted by adjusting the position of the tension rod 15 relative to the warp yarn. And, it also includes a tension detection sensor. The tension detection sensor is arranged on the warp yarn transmission path and is used to detect the tension of the warp yarn. The tension adjustment motor adjusts the tension rod according to the detected tension of the warp yarn, so that the tension of the warp yarn is constant within a preset range.

[0050] As Figure 7 shown, it is a control module diagram of a warp knitting machine. The warp knitting machine includes an industrial control computer and multiple single-chip microcomputers. Among them, the industrial control computer is the main control unit, and the multiple single-chip microcomputers are subordinate control units. Each single-chip microcomputer can control at least one warp supply roller to move. Among them, the industrial control computer can be connected to the single-chip microcomputer through RS-485 or other communication connections, and send the pattern data (i.e., the pattern data corresponding to the knitting pattern) to each single-chip microcomputer, and the single-chip microcomputer controls the driving motor of the warp supply roller to work. As Figure 7 shown, in this embodiment, the driving motor of the warp supply roller adopts a servo motor. Therefore, the single-chip microcomputer sends a control instruction to the servo motor driver, and then the servo motor driver controls the servo motor to rotate. Using a servo motor as the driving motor of the warp supply roller can accurately control the rotation angle of the supply roller and ensure the control accuracy of the warp supply roller.

[0051] The warp knitting machine controls the knitting device and the beam supply device to work together according to the pattern data corresponding to the knitting pattern, so that the beam supply length of each beam supply roller adapts to the warp yarn consumption of the corresponding knitting needle. Specifically, during the warp knitting process, the industrial control computer can first convert the designed pattern into pattern data recognizable by the servo motor controller board, and after dividing the pattern data, download it to the corresponding controller. In order to track the position of the main shaft (i.e., the knitting needle), an optical encoder is installed on the main shaft. The single-chip microcomputer receives the position information about the main shaft by capturing the pulse output signal of the encoder, communicates with the industrial control computer periodically. The industrial control computer receives the signal sent by the single-chip microcomputer and preferentially sends control instructions (address, compensation value, characteristic position information, etc.) to the slave station controller (i.e., the single-chip microcomputer of the corresponding unit), and receives the status information from the controller, which are respectively used for the drive motor of the beam supply roller and the tension adjustment motor of the tension lever. The slave station controller (i.e., the single-chip microcomputer) completes the pattern reading according to the instruction sent by the industrial control computer, sends a signal to a specific servo motor control board according to the pattern data to notify it to rotate its specific servo motor driver to send control pulses to complete the yarn feeding of the servo motor. The pulse output signal of the encoder serves as the servo motor synchronization signal. The servo motor also provides position control information to its servo motor controller board, thus allowing two-way processing of the position information.

[0052] Since the yarn is always in motion during the warp knitting process, the tension will change continuously. The magnitude of the tension determines the yarn feeding amount. Therefore, it is necessary to accurately control the magnitude of the tension. As Figure 8 shown, in one embodiment, the warp knitting machine also performs warp yarn tension feedback control during the knitting process. The warp yarn tension is monitored in real time through hardware such as a tension sensor, and the position of the tension lever is adjusted by the tension adjustment motor to control the warp yarn tension, thereby realizing the closed-loop control of the warp yarn tension and ensuring the warp knitting accuracy of the knitting device. This warp knitting machine with tension closed-loop control is particularly suitable for high-precision and high-speed warp knitting fabric processing occasions. This tension system collects the yarn tension signal during the operation of the warp knitting machine, compares it with the predetermined tension value through feedback, obtains the difference, amplifies it, and controls the tension adjustment motor, thereby further controlling the yarn tension to keep the yarn tension within the normal range throughout the process.

[0053] Furthermore, in order to ensure that the yarn feeding of the warp beam driving motor is synchronized with the main shaft during one loop-forming cycle, that is, the warp beam is synchronized with the knitting needles, the warp knitting machine adopts a discrete position control method for yarn feeding. One loop-forming cycle refers to the process in which the main roller drives the knitting needles to complete one reciprocating motion of up and down. The discrete position control method means that the warp knitting machine divides one loop-forming cycle of the main shaft into multiple equal parts, and the warp beam performs a yarn feeding action in each equal part. The discrete position control method evenly distributes the yarn feeding amount required for one loop-forming cycle of the main roller within the whole equal parts to achieve uniform yarn feeding. The accuracy of yarn feeding depends on the tracking accuracy of the main shaft.

[0054] It should be noted that although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications made to the embodiments described in this article, or the equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields are all included in the patent protection scope of the present invention.

Claims

1. A warp knitting machine, comprising a warp feeding device and a knitting device, the warp feeding device being used for feeding warp yarns to the knitting device, the knitting device comprising knitting needles and a main shaft for driving the knitting needles to work, characterized in that, The warp knitting machine controls the knitting device and the beamlet feeding device to work together according to the pattern data corresponding to the knitting pattern, so that the beamlet feeding lengths of the beamlet feeding rollers are adapted to the warp yarn consumption of the corresponding knitting needles; An encoder is provided on the main shaft for recording the position of the main shaft. The drive motor of the beamlet feeding roller uses the pulse signal output by the encoder as a synchronization signal to control the synchronous rotation of the beamlet feeding roller, so that the beamlet feeding length of the beamlet feeding roller is adapted to the warp yarn consumption of the corresponding knitting needle; The warp knitting machine divides one loop formation cycle of the main shaft into multiple equal parts, and the beamlet feeding roller performs a warp yarn feeding action in each equal part; The beamlet feeding device of the warp knitting machine includes multiple beamlet feeding rollers, and the beamlet feeding rollers are respectively used for feeding warp yarns to the knitting device. The beamlet feeding rollers are respectively connected with drive motors, and the drive motors drive the corresponding beamlet feeding rollers to rotate, so that the rotation speed of each beamlet feeding roller is controllable; It further includes multiple tension bars, and the tension bars are correspondingly arranged at the front end in the warp yarn transmission direction of the beamlet feeding roller. The warp yarn is transmitted to the front end in the transmission direction through the tension bar, and the tension bar is used for adjusting the tension of the warp yarn; It further includes a tension adjusting motor, and the tension adjusting motor is connected with the tension bar for adjusting the position of the tension bar relative to the warp yarn to adjust the tension of the warp yarn; It further includes a tension detection sensor, and the tension detection sensor is arranged on the warp yarn transmission path for detecting the tension of the warp yarn; The tension adjusting motor adjusts the tension bar according to the detected warp yarn tension, so that the tension of the warp yarn is constant within a preset range; The tension bar includes a driving rod, a driven rod, a tension adjusting motor and an adjusting seat. The tension adjusting motor is connected with the driving rod. The driving rod and the driven rod are oppositely arranged on the adjusting seat. The warp yarn passes through between the driving rod and the driven rod, and the tension of the warp yarn is adjusted by adjusting the position of the tension bar relative to the warp yarn.

2. The warp knitting machine according to claim 1, characterized in that, The multiple beamlet feeding rollers are rotatably arranged on the panel in the axial direction. The drive motor is oppositely arranged on the back of the panel with the corresponding beamlet feeding roller, and the drive motor is in transmission connection with the beamlet feeding roller through a gear set.

3. The warp knitting machine according to claim 2, characterized in that, The beamlet feeding roller includes a first roller body and a second roller body. The gear set includes a first gear, a second gear and a third gear. The first gear is arranged on the rotating shaft of the drive motor. The second gear is connected with the first roller body. The third gear is connected with the second roller body. The first gear meshes with the second gear. The second gear meshes with the third gear. The roller surfaces of the first roller body and the second roller body are tangent to each other. The warp yarn enters the first roller body from the first tangent direction, winds around the roller surface of the first roller body, passes between the first roller body and the second roller body, and then winds around the roller surface of the second roller body and extends out from the second tangent direction.

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