KR20130068855A - Yarn conveying system for circular knitting machines - Google Patents

Abstract

PURPOSE: A conveying system of thread is provided to smoothly supply thread to a thread supplier of the circular knitting machine by providing a driving device on a thread conveying tray, and to weave warps by the circular knitting machine. CONSTITUTION: A conveying system of thread for a circular knitting machine comprises: the circular knitting machine(10) with a needle cylinder(11) and one or more thread suppliers(12) placed on the needle cylinder in a circular form; one or more thread conveying trays(20) which are wound by two or more separated threads and have a driving device which rotates the thread conveying tray to supply threads to the thread suppliers; and a control unit which is electrically connected to the driving device and controls rotation speed of the thread conveying tray by generating a driving signal transmitted to the driving device.

Description

Yarn conveying system for circular knitting machine {YARN CONVEYING SYSTEM FOR CIRCULAR KNITTING MACHINES}

The present invention relates to a yarn conveying system for a circular knitting machine, and more particularly, to a smooth yarn conveying system for a circular knitting machine.

Denim is a roughly woven cotton fabric that is widely used as a durable fiber in work clothes or fashion clothes. The prior art of producing denim is winding a large number of warp yarns (around 6000 pieces) on one yarn beam, dyeing it with Indigo, and then indigo color the warps with a reducing agent. To wear.

Generally, the dyed indigo warps wound on the yarn beam are woven by a shuttle loom. When the shuttle loom weaves the yarns, the yarn beam is guided by the yarns to passively feed the warp yarns. That is, the yarn beam is driven to rotate by the pulling force of the yarns woven into the shuttle loom. The yarn beam is very heavy, but the weaving speed of the shuttle loom slows down and many warps are guided at the same time, and the thread is rarely broken by the tension of the warp yarns pulling the yarn beam. However, since the shuttle loom has a relatively slow weaving speed, the production of denim is limited.

The main object of the present invention is to solve the problems of the prior art which result in lower fabric productivity of weaving warps by shuttle looms.

In order to achieve the above object, the present invention provides a yarn conveying system for a circular knitting machine comprising a circular knitting machine, at least one yarn conveying tray and a control unit electrically connected to the circular knitting machine and the yarn conveying tray. The circular knitting machine includes a needle cylinder and one or more thread feeders disposed annularly on the needle cylinder. The seal conveying tray includes a drive device which is wound by two or more separate seals and rotationally drives the seal conveying tray to supply the seals to the seal feeder through a seal conveying path. The control unit generates the yarn supply signal transmitted to the circular knitting machine to control the yarn supply speed, and generates a drive signal transmitted to the drive device to control the rotation speed of the yarn conveyance tray.

In one embodiment, the drive device drives the yarn transport tray which rotates in accordance with the drive signal such that the yarns wound on the yarn transport tray are fed to the yarn feeder at a selected yarn transport speed. The yarn conveyance speed is the same as the yarn feed rate of the circular knitting machine.

In one embodiment, the control unit generates a drive signal in accordance with the set yarn feed speed to determine the rotational speed of the yarn carrying tray.

It is another object of the present invention to adjust the tension of the yarns on the thread conveying path during the knitting operation of the circular knitting machine.

In order to achieve the above object, the present invention provides at least one seal buffer device electrically connected to the control unit on the seal conveying path.

In one embodiment, the seal buffer device sends a first buffer signal to the control unit according to the tension force of the seal on the seal transport path to adjust the rotational speed of the seal transport tray driven by the drive device.

In one embodiment, the seal buffer device comprises a moving part connected to each seal and one or more movement detection devices for detecting the position of the moving part. The movement detection device is electrically connected to the control unit.

In one embodiment, the movement detection apparatus is predetermined to determine the movement detection range corresponding to the positions of the moving parts, the first sensor located at the upper limit of the movement detection range and the first position located at the lower limit of the movement detection range 2 sensors are included. When the moving part moves out of the moving detection range, the first sensor or the second sensor generates a second buffer signal to the control unit.

In one embodiment, the first and second sensors of the other moving parts detect a shut-down signal when they detect the other moving parts that move outside the upper and lower limits of the movement detection range, respectively, the control unit. Raises in.

In one embodiment, the movement detection device comprises one or more third sensors located between the first sensor and the second sensor. A plurality of third sensors of other moving parts detect the positions of the other moving parts and send the detected positions to the control unit. The control unit calculates the average position of all moving parts and adjusts the rotational speed of the seal conveying tray driven by the drive device in comparison with the initial position stored in the control unit.

In addition to the above additional objects, features and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings.

The yarn conveying system according to the present invention provides a drive device on the yarn conveying tray to smoothly feed the yarn to the yarn feeder of the circular knitting machine, whereby the warp yarns can be squeezed. Further, by providing a control unit electrically connected to the circular knitting machine and a drive device for adjusting the yarn conveying speed of the yarn conveying tray which is the same as the yarn feeding speed of the yarn feeder of the circular knitting machine, the inclinations at different speeds are provided. Breaking can be reduced. In addition, by providing the thread buffer device on the thread conveying path to detect and feed back the tensile force of the warp yarns and to adjust the thread conveying speed, the quality of the fabric can be assured without being affected by too large or too small tensile force. have. Compared with the conventional tensile force sensor, the thread buffer device of the present invention can accurately control the tensile force of the thread by providing the state of the individual thread to the control unit.

1 is a schematic diagram of a structure of a seal conveying system according to an embodiment of the present invention.
2 is a schematic side view of a structure of a seal conveying system according to an embodiment of the present invention.
3 is a structural block diagram according to an embodiment of the present invention.
4 is a partially enlarged view of a seal buffer device according to an embodiment of the present invention.

1, 2 and 3 will be described a seal conveying system according to an embodiment of the present invention. This is for use in a circular knitting machine 10 comprising a needle cylinder 11 and one or more thread feeders 12 annularly arranged on the needle cylinder 11. The circular knitting machine 10 drives the first power converter 13 and the yarn feeder 12 to obtain a power output from the first power converter 13 so as to perform yarn knitting. ) Is further provided. The first power converter 13 may be a transformer from direct current (DC) to alternating current (AC).

In this embodiment, the circular knitting machine is also electrically connected to the first power converter 13 so as to send the actual supply signal S1 according to the setting of the first power converter 13 to the main power supply. It is provided with the control unit 40 which controls the real feed speed of the said yarn feeder 12 driven by the drive motor 14. As shown in FIG. The control unit 40 includes a drive interface 41 for receiving a user's input command. The drive interface 41 may be a keyboard or a touch screen. Apart from being installed on the circular knitting machine 10 as in this embodiment, the control unit 40 is also external to the circular knitting machine 10 by connecting to the first power converter 13 by wires. Can be positioned independently of

The present invention also includes one or more yarn conveying trays 20 for feeding the yarns 30 to the circular knitting machine 10. The seal transport tray 20 is wound by two or more separate seals 30. The number of seals 30 can be adjusted according to the number of seal feeders 12. In this embodiment, each seal transport tray 20 may hold at least 32 individual seals 30. That is, the yarns 30 wound on the yarn transport tray 20 may be provided simultaneously to the yarn feeder 12 for knitting. In this embodiment the seal conveying tray 20 for supplying a plurality of warps 30 is referred to as a yarn beam. In order to facilitate the rotation of the seal transport tray 20, a bearing rack 21 is provided on one side of the seal transport tray 20. Compared to the seal barrel for feeding the yarns in the conventional circular knitting machine, the seal conveying tray 20 is formed with a larger size and a heavier weight. In order to prevent the seals 30 from being broken by too large a tension while only being pulled by the circular knitting machine 10 to drive the thread carrying tray 20 during the knitting operation, referring to FIG. In addition, the bearing rack 21 includes a second power converter 22 and a drive device 23 positioned thereon to obtain the power output from the second power converter 22. As shown in FIG. 2, the driving device 23 smoothly rotates the seal transport tray 20 such that the seals 30 are supplied to the seal feeder 12 through a seal transport path R. As shown in FIG. Drive it. The drive device 23 may be an AC motor. The second power converter 22 may be a transformer of direct current to alternating current. The control unit 40 may be electrically connected to the second power conversion device 22, and transmits a driving signal S2 to the second power conversion device 22 to transmit power to the driving device 23. By controlling the rotation speed of the seal transport tray 20. The driving device 23 performs the seal conveying tray based on the drive signal S2 such that the inclinations 30 wound on the seal conveying tray 20 are supplied to the seal feeder 12 at a desired seal conveying speed. Drive 20 in rotation. In this embodiment, the delivery of the yarns 30 from the yarn carrying tray 20 takes place simultaneously with the input of the yarn feeder 12. That is, the yarn conveyance speed of the seals 30 on the yarn transport tray 20 is the same as the yarn feed rate of the yarn feeder 12. In the above-described embodiment, the control unit 40 may be electrically connected to the circular knitting machine 10 and the driving device 23, or may be independently connected to the driving device 23. That is, only one drive signal S2 is sent to the drive device 23 to control the rotational speed of the seal conveyance tray 20.

Referring to FIG. 3, the yarn conveying speed of the yarns 30 on the yarn conveying tray 20 and the yarn feed rate of the yarn feeder 12 are transmitted to the control unit 40 or the control unit 40 in advance. It can be immediately controlled by the user through pre-entered drive variables. Thereby, the circular knitting machine 10 for the control unit 40 to generate the seal supply signal S1 and the drive signal S2 and to transmit it to the circular knitting machine 10 and the driving device 23. And the driving device 23 are set. Another embodiment provides a preset algorithm of the control unit 40 to generate a drive signal S2 to control the yarn feed rate at a desired rotational speed in accordance with the set yarn feed signal S1. The seal conveyance tray 20 is driven to rotate.

In order to stably control the tensile force of the yarns 30 supplied to the circular knitting machine 10, the yarn conveying system of the present invention is electrically connected to the control unit 40, as shown in FIG. It further comprises one or more seal buffer devices 50 on the seal conveying path R of each seal 30. In this embodiment, referring to FIGS. 1, 2 and 4, the seal buffer device 50 mainly comprises a frame 51 having a plurality of parallel moving tracks 52, each moving track 52. A moving part 53 located on and connected to each seal 30, and one or more moving detection devices for detecting the position of the moving part 53. The frame 51 has one or more threaded holes 511 passed by the thread 30 in a limited thread conveying direction. Each moving part 53 has a steel wire 521 passing through the support 531 to vertically move the moving part 53. The movement detection apparatus determines a movement detection range P corresponding to the positions of the movement component 53 in advance, and includes a first sensor 541 and the movement detection positioned at an upper limit of the movement detection range P. FIG. And a second sensor 542 located at the lower limit of the range P. The first and second sensors 541, 542 are electrically connected to the control unit 40.

When the tensile force of any seal 30 is increased, the moving part 53 connected thereto is moved upward on the moving track 52. When the moving part 53 moves beyond the upper limit of the movement detection range P and is detected by the first sensor 541, the first sensor 541 drives the second buffer signal S3. To the control unit 40 controlling the device 23 to increase the rotational speed of the seal conveying tray 20. On the other hand, if the tensile force of either thread 30 decreases, the moving part 53 connected thereto is moved downward on the moving track. When the moving part 53 moves beyond the lower limit of the movement detection range P and is detected by the second sensor 542, the second sensor 542 receives another second buffer signal S3. It occurs in the control unit 40 which controls the drive device 23 to reduce the rotational speed of the seal conveying tray 20. In order to prevent too much tensile force difference between the different seals 30, the first and second sensors 541, 542 of the other moving parts 53 are adapted to detect the movement of the other moving parts 53, respectively. At the same time it is detected that the movement exceeds the upper and lower limits of the range P, a cutoff signal S4 is generated in the control unit 40.

In addition, to more accurately detect the position of the moving part 53, the movement detection device also includes one or more third sensors 543 between the first and second sensors 541, 542. A plurality of third sensors 543 are disposed along the movement detection range P to detect the position of the moving part 53. A plurality of third sensors 543 detect the positions of the other moving parts 53 and transmit the detected positions to the control unit which calculates the average position of all the moving parts 53 and compares it with the stored initial position, The drive signal S2 is sent to the drive device 23 to adjust the rotation speed of the seal conveyance tray 20.

In order to prevent the circular knitting machine from rotating slowly due to the breaking of the thread, resulting in an improperly finished fabric product, the yarn conveying system of the present invention corresponds to each thread 30, as shown in FIG. It further comprises a broken seal sensor 60 on the frame 51 of the seal buffer device 50. The breaking chamber sensor 60 is electrically connected to the control unit 40, is located below the moving part 53, and is triggered by the moving part 53 to block the control unit 40. (S5) can be generated.

In conclusion, the yarn conveying system for the circular knitting machine of the present invention employs the yarn conveying tray used in the conventional shuttle loom in the circular knitting machine. The yarn carrying tray smoothly supplies a large amount of separate yarns by a driving device to the circular knitting machine to prevent the yarns from being broken by the pulling force of the yarns insufficient to pull the yarn carrying tray during the knitting operation. By providing a control unit electrically connected to the circular knitting machine and a drive device of the thread conveying tray to adjust the rotational speed of the thread conveying tray, the thread conveying speed of the yarns on the thread conveying tray is controlled by the thread of the circular knitting machine. It can be adjusted to be equal to the actual feed rate of the feeder. In addition, in order to ensure the quality of the finished fabric product, detecting the tension of the yarns and feeding the first buffer signal to the control unit based on the tension of the yarns to convey the yarns as desired A seal buffer device is provided on the seal conveying path to immediately adjust the rotational speed of the tray. Therefore, the present invention provides significant improvements over the prior art.

Preferred embodiments of the present invention are disclosed in the detailed description, and various modifications as well as other embodiments of the present invention can be made by those skilled in the art. Accordingly, the claims are intended to cover all embodiments without departing from the spirit and scope of the invention.

Claims (9)

A circular knitting machine comprising a needle cylinder and one or more thread feeders disposed annularly on the needle cylinder;
One or more yarn conveying trays wound by two or more separate seals and comprising a drive device for rotationally driving a seal conveying tray to supply the seals to the thread feeder through a thread conveying path; And
And a control unit electrically connected to the drive device, the drive unit generating a drive signal transmitted to the drive device to control the rotational speed of the yarn transport tray. The method of claim 1,
The drive device drives the yarn conveying tray rotating in accordance with the drive signal such that the yarns wound on the yarn conveying tray are supplied to the yarn feeder at a yarn conveying speed selected to be equal to the yarn feed rate of the circular knitting machine. Seal conveying system, characterized in that. The method of claim 1,
And the control unit generates a drive signal based on the set yarn supply speed to determine the rotational speed of the yarn transport tray. The method of claim 1,
And at least one seal buffer device electrically connected to a control unit on the seal delivery path. 5. The method of claim 4,
And the seal buffer device sends a first buffer signal based on the tensile force of the seal on the seal conveying path to the control unit to adjust the rotational speed of the seal conveying tray driven by the drive device. 5. The method of claim 4,
The seal buffer device comprises a moving part connected to each seal and at least one movement detecting device for detecting a position of the moving part, the movement detecting device being electrically connected to the control unit. . The method according to claim 6,
The movement detecting apparatus predetermines a movement detection range corresponding to the positions of the moving parts, and includes a first sensor located at an upper limit of the movement detection range and a second sensor located at a lower limit of the movement detection range. And the first sensor or the second sensor generates a second buffer signal to the control unit when the moving part moves out of the moving detection range. The method of claim 7, wherein
The actual conveying system of claim 1, wherein the first sensors and the second sensors of the other moving parts generate a blocking signal to the control unit when detecting the other moving parts moving outside the upper and lower limits of the moving detection range, respectively. . The method of claim 7, wherein
The movement detecting device includes one or more third sensors positioned between the first sensor and the second sensor, the plurality of third sensors detecting positions of other moving parts and transmitting the detected positions to the control unit. And the control unit calculates an average position of all moving parts and adjusts the rotational speed of the seal conveying tray driven by the drive device in comparison with the initial position stored in the control unit.

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