EP2602366A1 - Yarn conveying system for circular knitting machines - Google Patents
Yarn conveying system for circular knitting machines Download PDFInfo
- Publication number
- EP2602366A1 EP2602366A1 EP11191962.7A EP11191962A EP2602366A1 EP 2602366 A1 EP2602366 A1 EP 2602366A1 EP 11191962 A EP11191962 A EP 11191962A EP 2602366 A1 EP2602366 A1 EP 2602366A1
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- EP
- European Patent Office
- Prior art keywords
- yarn
- yarn conveying
- control unit
- circular knitting
- yarns
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/38—Devices for supplying, feeding, or guiding threads to needles
- D04B15/44—Tensioning devices for individual threads
Definitions
- the present invention relates to a yarn conveying system for circular knitting machines and particularly to an active yarn conveying system for circular knitting machines, as well as to a circular knitting machine comprising such a yarn conveying system.
- Denim is a coarse weave cotton cloth widely used on wear-resistant fabric for working and fashion clothes.
- the conventional technique of producing denim is winding a great number of warp yarns (such as 6000 pieces) on a single yarn beam and dyeing the yarns with Indigo, and coloring via a reducing agent to form an indigo color on the warp yarns.
- the dyed indigo warp yarns wound on the yarn beam are woven via a shuttle loom.
- the shuttle loom weaves the yarns, the yarn beam is drawn by the yarns to passively supply the warp yarns. Namely, the yarn beam is driven to rotate by the drawing force of the yarns woven on the shuttle loom.
- the yarn beam is quite heavy, the weaving speed of the shuttle loom slows down and a great number of the warp yarns are drawn at the same time, broken yarns caused by the tension of the warp yarns drawing the yarn beam are seldom.
- the shuttle loom has a relatively slow weaving speed, production of denim is limited.
- the primary object of the present invention is to solve the problem of the conventional technique of weaving warp yarns via the shuttle loom that results in lower fabric production.
- the present invention provides a yarn conveying system for circular knitting machines that includes at least one yarn conveying tray and a control unit electrically connected to the circular knitting machine and yarn conveying tray.
- the circular knitting machine coupled to the yarn conveying system has a needle cylinder and at least one yarn feeder arranged annularly on the needle cylinder.
- Around the yarn conveying tray at least two separate yarns are wound so that the yarn conveying tray is configured to convey at least two separate yarns and the yarn conveying tray comprises a driving device to drive the yarn conveying tray to rotate so that the yarns are supplied via a yarn conveying path to the yarn feeder.
- the control unit generates a yarn feeding signal, which is sent to the circular knitting machine to control the yarn feeding speed, and a driving signal, which is sent to the driving device to control the rotational speed of the yarn conveying tray.
- the driving device drives the yarn conveying tray to rotate according to the driving signal so that the yarns wound on the yarn conveying tray are supplied at a selected yarn conveying speed to the yarn feeder.
- the yarn conveying speed is the same as the yarn feeding speed of the circular knitting machine.
- control unit generates the driving signal according a set yarn feeding speed to determine the rotational speed of the yarn conveying tray.
- a further related object of the invention is to regulate the tension of the yarns on the yarn conveying path during knitting operation of the circular knitting machine.
- the invention provides at least one yarn buffer device electrically connected to the control unit on the yarn conveying path.
- the yarn buffer device outputs a first buffer signal according to the tension of the yarns on the yarn conveying path to the control unit to adjust the rotational speed of the yarn conveying tray driven by the driving device.
- the yarn buffer device has at least one moving element coupled on each yarn and at least one movement detection device to detect the positions of the moving element.
- the movement detection device is electrically connected to the control unit.
- the movement detection device predetermines a movement detection range corresponding to the moving element 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. In the event that the moving element moves beyond the movement detection range, the first sensor or the second sensor generates a second buffer signal to the control unit.
- the first sensors and second sensors of different moving elements generate a shut-down signal to the control unit upon detecting different moving elements respectively moving beyond the upper limit and lower limit of the movement detection range.
- the movement detection device includes at least one third sensor located between the first and second sensors. Multiple third sensors of different moving elements detect the positions of different moving elements and send the detected positions to the control unit. The control unit calculates an average position of all moving elements and compares with an initial position stored in the control unit to regulate the rotational speed of the yarn conveying tray driven by the driving device.
- the yarn conveying system enables a driving device on the yarn conveying tray to actively supply yarn to the yarn feeder of the circular knitting machine, so that the circular knitting machine can knit warp yarns at an enhanced speed, reliability and reduced costs.
- the control unit that is electrically connected to the circular knitting machine and driving device to regulate the yarn conveying speed of the yarn conveying tray synchronous with the yarn feeding speed of the yarn feeder of the circular knitting machine, the broken warp yarns caused by different speeds can be reduced.
- the yarn buffer device on the yarn conveying path to normally detect the tension of the warp yarns to feed back and regulate the yarn conveying speed, the quality of fabrics can be ensured without being affected by too great or too little tension.
- the yarn buffer device of the invention provides individual yarn conditions to the control unit, thereby can accurately control the tension of the yarn.
- FIGS. 1 , 2 and 3 Please refer to FIGS. 1 , 2 and 3 for an embodiment of the yarn conveying system of the invention. It is used in combination with a circular knitting machine 10 which includes a needle cylinder 11 and at least one yarn feeder 12 arranged annularly on the needle cylinder 11.
- the circular knitting machine 10 further has a first power converter 13 and a main driving motor 14 receiving power output from the first power converter 13 to drive the yarn feeder 12 to perform yarn knitting.
- the first power converter 13 may be a DC to AC transformer.
- the circular knitting machine 10 also has a control unit 40 electrically connected to the first power converter 13 to output a yarn feeding signal S1 according to setting to the first power converter 13 to control the yarn feeding speed of the yarn feeder 12 driven by the main driving motor 14.
- the control unit 40 includes an operation interface 41 to receive user's input commands.
- the operation interface 41 can be a keyboard or a touch screen.
- the control unit 40 aside from being installed on the circular knitting machine 10 as it is the case in this embodiment, can also be independently located outside the circular knitting machine 10 by connecting to the first power converter 13 via a power cord.
- the invention also includes at least one yarn conveying tray 20 to supply yarns 30 to the circular knitting machine 10.
- the yarn conveying tray 20 is wound by at least two separate yarns 30 and is configured to convey at least two separate yarns 30.
- the number of the yarns 30 can be adjusted according to the number of the yarn feeder 12.
- each yarn conveying tray 20 holds at least 32 individual yarns 30.
- the yarns 30 wound on the yarn conveying tray 20 can be supplied simultaneous to the yarn feeder 12 for knitting.
- the yarn conveying tray 20 in this invention to supply multiple warp yarns 30 also is called a yarn beam.
- a bearing rack 21 is provided at one side of the yarn conveying tray 20.
- the yarn conveying tray 20 Compared with a conventional yarn barrel, which supplies the yarns in the conventional circular knitting machine, the yarn conveying tray 20 according to the present invention is formed at a larger size and a heavier weight.
- the bearing rack 21 has a second power converter 22 and a driving device 23 located thereon to receive power output from the second power converter 22.
- the driving device 23 actively drives the yarn conveying tray 20 rotating so that the yarns 30 can be supplied to the yarn feeder 12 via a yarn conveying path R as shown in FIG. 2 .
- the driving device 23 can be an AC motor.
- the second power converter 22 can be a DC to AC transformer.
- the control unit 40 is electrically connected to the second power converter 22 and transmits a driving signal S2 to the second power converter 22 to regulate the power output therefrom to the driving device 23, thereby to control the rotational speed of the yarn conveying tray 20.
- the driving device 23 drives the yarn conveying tray 20 rotating based on the driving signal S2 so that the warp yarns 30 wound on the yarn conveying tray 20 are supplied to the yarn feeder 12 at a desired yarn conveying speed.
- output of the yarns 30 from the yarn conveying tray 20 is synchronous with input of the yarn feeder 12; namely, the yarn conveying speed of the yarns 30 on the yarn conveying tray 20 is the same as the yarn feeding speed of the yarn feeder 12.
- control unit 40 is electrically connected to the circular knitting machine 10 and driving device 23, or also can be independently connected to the driving device 23, namely merely one driving signal S2 is output to the driving device 23 to control the rotational speed of the yarn conveying tray 20.
- the yarn conveying speed of the yarns 30 on the yarn conveying tray 20 and yarn feeding speed of the yarn feeder 12 can be controlled instantly by users via the control unit 40 or via preset operation parameters entered into the control unit 40 in advance, thereby to set the circular knitting machine 10 and driving device 23 so that the control unit 40 generates the yarn feeding signal S1 and the driving signal S2 and sends to the circular knitting machine 10 and driving device 23.
- Another alternative is providing a preset algorithm in the control unit 40 to generate a driving signal S2 to drive the yarn conveying tray 20 rotating at the desired rotational speed according to a set yarn feeding signal S1 that controls the yarn feeding speed.
- the yarn conveying system of the invention further includes at least one yarn buffer device 50 on the yarn conveying path R of each yarn 30 that is electrically connected to the control unit 40 as shown in FIG. 2 .
- the yarn buffer device 50 mainly includes a frame 51 with a plurality of parallel movement tracks 52 located thereon, a moving element 53 located on each movement track 52 and coupled on each yarn 30, and at least one movement detection device to detect the positions of the moving element 53.
- the frame 51 has at least one yarn eyelet 511 threaded through by the yarn 30 in a confined yarn conveying direction.
- Each moving element 53 has at least one holding portion 531 at one side.
- the movement track 52 has a steel wire 521 threaded through the holding portion 531 to move the moving element 53 vertically.
- the movement detection device predetermines a movement detection range P corresponding to the positions of the moving element 53, and includes a first sensor 541 located at an upper limit of the movement detection range P and a second sensor 542 located at a lower limit of the movement detection range P.
- the first and second sensors 541 and 542 are electrically connected to the control unit 40.
- the moving element 53 coupled thereon When the tension of any yarn 30 increases, the moving element 53 coupled thereon is moved upwards on the movement track 52. In the event that the moving element 53 moves beyond the upper limit of the movement detection range P and is detected by the first sensor 541, the first sensor 541 generates a second buffer signal S3 to the control unit 40 which controls the driving device 23 to increase the rotational speed of the yarn conveying tray 20. On the other hand, when the tension of any yarn 30 decreases, the moving element 53 coupled thereon is moved downwards on the movement track 52. In the event that the moving element 53 moves beyond the lower limit of the movement detection range P and is detected by the second sensor 542, the second sensor 542 generates another second buffer signal S3 to the control unit 40 which controls the driving device 23 to decrease the rotational speed of the yarn conveying tray 20.
- shut-down signal S4 is generated to the control unit 40.
- the movement detection device also includes at least one third sensor 543 between the first and second sensors 541 and 542. Multiple third sensors 543 are arranged along the movement detection range P to get the position of the moving element 53. Multiple third sensors 543 detect the positions of different moving elements 53 and send the detected positions to the control unit 40 which calculates an average position of all moving elements 53 and compares with an initial position stored therein, and then outputs the driving signal S2 to the driving device 23 to regulate the rotational speed of the yarn conveying tray 20.
- the yarn conveying system of the invention further includes a broken yarn sensor 60 on the frame 51 of the yarn buffer device 50 corresponding to each yarn 30 as shown in FIG. 4 .
- the broken yarn sensor 60 is electrically connected to the control unit 40, and located below the moving element 53, and can be triggered by the moving element 53 to generate a shut-down signal S5 to the control unit 40.
- the yarn conveying system for circular knitting machines of the present invention employs the yarn conveying tray used in the conventional shuttle loom to the circular knitting machine.
- the yarn conveying tray can actively supply multiple separate yarns via a driving device to the circular knitting machine to prevent the yarns from breaking caused by insufficient drawing force of the yarns to draw the yarn conveying tray during knitting operation.
- the control unit that is electrically connected to the circular knitting machine and driving device of the yarn conveying tray to regulate the rotational speed of the yarn conveying tray, the yarn conveying speed of the yarns on the yarn conveying tray can be regulated to synchronize with the yarn feeding speed of the yarn feeder of the circular knitting machine.
- the yarn buffer device is provided on the yarn conveying path to detect the tension of the yarns and feed back a first buffer signal to the control unit based on the tension of the yarns to instantly regulate the rotational speed of the yarn conveying tray to maintain the tension of the yarns as desired.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
Abstract
A yarn conveying system for a circular knitting machine (10), includes at least one yarn conveying tray (20) and a control unit (40) electrically connected to the circular knitting machine (10) and the yarn conveying tray (20). The circular knitting machine (10) has a needle cylinder (11) and at least one yarn feeder (12) arranged annularly on the needle cylinder (11). The yarn conveying tray (20) is wound by at least two separate yarns (30) and includes a driving device (23) to drive the yarn conveying tray (20) rotating so that the yarns (30) are supplied via a yarn conveying path (R) to the yarn feeder (12). The control unit (40) generates a yarn feeding signal (S1) to the circular knitting machine (10) to control yarn feeding speed and a driving signal (S2) to the driving device (23) to control rotational speed of the yarn conveying tray (20). Thus users can operate the control unit (40) to control speed of the yarns supplied from the yarn conveying tray (20) to the yarn feeder (12).
Description
- The present invention relates to a yarn conveying system for circular knitting machines and particularly to an active yarn conveying system for circular knitting machines, as well as to a circular knitting machine comprising such a yarn conveying system.
- Denim is a coarse weave cotton cloth widely used on wear-resistant fabric for working and fashion clothes. The conventional technique of producing denim is winding a great number of warp yarns (such as 6000 pieces) on a single yarn beam and dyeing the yarns with Indigo, and coloring via a reducing agent to form an indigo color on the warp yarns.
- In general, the dyed indigo warp yarns wound on the yarn beam are woven via a shuttle loom. As the shuttle loom weaves the yarns, the yarn beam is drawn by the yarns to passively supply the warp yarns. Namely, the yarn beam is driven to rotate by the drawing force of the yarns woven on the shuttle loom. Although the yarn beam is quite heavy, the weaving speed of the shuttle loom slows down and a great number of the warp yarns are drawn at the same time, broken yarns caused by the tension of the warp yarns drawing the yarn beam are seldom. However, as the shuttle loom has a relatively slow weaving speed, production of denim is limited.
- The primary object of the present invention is to solve the problem of the conventional technique of weaving warp yarns via the shuttle loom that results in lower fabric production.
- This problem is solved by a yarn conveying system according to claim 1 and by a circular knitting machine according to
claim 10. Further advantageous embodiments are the subject-matter of the dependent claims. - To achieve the foregoing object, the present invention provides a yarn conveying system for circular knitting machines that includes at least one yarn conveying tray and a control unit electrically connected to the circular knitting machine and yarn conveying tray. The circular knitting machine coupled to the yarn conveying system has a needle cylinder and at least one yarn feeder arranged annularly on the needle cylinder. Around the yarn conveying tray at least two separate yarns are wound so that the yarn conveying tray is configured to convey at least two separate yarns and the yarn conveying tray comprises a driving device to drive the yarn conveying tray to rotate so that the yarns are supplied via a yarn conveying path to the yarn feeder. The control unit generates a yarn feeding signal, which is sent to the circular knitting machine to control the yarn feeding speed, and a driving signal, which is sent to the driving device to control the rotational speed of the yarn conveying tray.
- In one embodiment the driving device drives the yarn conveying tray to rotate according to the driving signal so that the yarns wound on the yarn conveying tray are supplied at a selected yarn conveying speed to the yarn feeder. The yarn conveying speed is the same as the yarn feeding speed of the circular knitting machine.
- In one embodiment the control unit generates the driving signal according a set yarn feeding speed to determine the rotational speed of the yarn conveying tray.
- A further related object of the invention is to regulate the tension of the yarns on the yarn conveying path during knitting operation of the circular knitting machine.
- To achieve the foregoing object, the invention provides at least one yarn buffer device electrically connected to the control unit on the yarn conveying path.
- In one embodiment the yarn buffer device outputs a first buffer signal according to the tension of the yarns on the yarn conveying path to the control unit to adjust the rotational speed of the yarn conveying tray driven by the driving device.
- In one embodiment the yarn buffer device has at least one moving element coupled on each yarn and at least one movement detection device to detect the positions of the moving element. The movement detection device is electrically connected to the control unit.
- In one embodiment the movement detection device predetermines a movement detection range corresponding to the moving element 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. In the event that the moving element moves beyond the movement detection range, the first sensor or the second sensor generates a second buffer signal to the control unit.
- In one embodiment the first sensors and second sensors of different moving elements generate a shut-down signal to the control unit upon detecting different moving elements respectively moving beyond the upper limit and lower limit of the movement detection range.
- In one embodiment the movement detection device includes at least one third sensor located between the first and second sensors. Multiple third sensors of different moving elements detect the positions of different moving elements and send the detected positions to the control unit. The control unit calculates an average position of all moving elements and compares with an initial position stored in the control unit to regulate the rotational speed of the yarn conveying tray driven by the driving device.
- The yarn conveying system according to the invention enables a driving device on the yarn conveying tray to actively supply yarn to the yarn feeder of the circular knitting machine, so that the circular knitting machine can knit warp yarns at an enhanced speed, reliability and reduced costs. Moreover, by providing the control unit that is electrically connected to the circular knitting machine and driving device to regulate the yarn conveying speed of the yarn conveying tray synchronous with the yarn feeding speed of the yarn feeder of the circular knitting machine, the broken warp yarns caused by different speeds can be reduced. In addition, by providing the yarn buffer device on the yarn conveying path to normally detect the tension of the warp yarns to feed back and regulate the yarn conveying speed, the quality of fabrics can be ensured without being affected by too great or too little tension. Compared with the conventional tension sensor, the yarn buffer device of the invention provides individual yarn conditions to the control unit, thereby can accurately control the tension of the yarn.
- The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
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FIG. 1 is a schematic view of the structure of an embodiment of the yarn conveying system of the invention. -
FIG. 2 is a schematic side view of the structure of an embodiment of the yarn conveying system of the invention. -
FIG. 3 is a structural block diagram of an embodiment of the invention. -
FIG. 4 is a fragmentary enlarged view of an embodiment of the yarn buffer device of the invention. - Please refer to
FIGS. 1 ,2 and3 for an embodiment of the yarn conveying system of the invention. It is used in combination with acircular knitting machine 10 which includes aneedle cylinder 11 and at least oneyarn feeder 12 arranged annularly on theneedle cylinder 11. Thecircular knitting machine 10 further has afirst power converter 13 and a main drivingmotor 14 receiving power output from thefirst power converter 13 to drive theyarn feeder 12 to perform yarn knitting. Thefirst power converter 13 may be a DC to AC transformer. - In this embodiment, the
circular knitting machine 10 also has acontrol unit 40 electrically connected to thefirst power converter 13 to output a yarn feeding signal S1 according to setting to thefirst power converter 13 to control the yarn feeding speed of theyarn feeder 12 driven by themain driving motor 14. Thecontrol unit 40 includes anoperation interface 41 to receive user's input commands. Theoperation interface 41 can be a keyboard or a touch screen. Thecontrol unit 40, aside from being installed on thecircular knitting machine 10 as it is the case in this embodiment, can also be independently located outside thecircular knitting machine 10 by connecting to thefirst power converter 13 via a power cord. - The invention also includes at least one
yarn conveying tray 20 to supplyyarns 30 to thecircular knitting machine 10. Theyarn conveying tray 20 is wound by at least twoseparate yarns 30 and is configured to convey at least twoseparate yarns 30. The number of theyarns 30 can be adjusted according to the number of theyarn feeder 12. In this embodiment, eachyarn conveying tray 20 holds at least 32individual yarns 30. Namely, theyarns 30 wound on theyarn conveying tray 20 can be supplied simultaneous to theyarn feeder 12 for knitting. Theyarn conveying tray 20 in this invention to supplymultiple warp yarns 30 also is called a yarn beam. To facilitate rotation of theyarn conveying tray 20, abearing rack 21 is provided at one side of theyarn conveying tray 20. Compared with a conventional yarn barrel, which supplies the yarns in the conventional circular knitting machine, theyarn conveying tray 20 according to the present invention is formed at a larger size and a heavier weight. To prevent theyarns 30 from breaking caused by too great tension while being drawn merely by thecircular knitting machine 10 to drive theyarn conveying tray 20 during knitting operation, referring toFIG. 3 , thebearing rack 21 has asecond power converter 22 and adriving device 23 located thereon to receive power output from thesecond power converter 22. Thedriving device 23 actively drives theyarn conveying tray 20 rotating so that theyarns 30 can be supplied to theyarn feeder 12 via a yarn conveying path R as shown inFIG. 2 . Thedriving device 23 can be an AC motor. Thesecond power converter 22 can be a DC to AC transformer. Thecontrol unit 40 is electrically connected to thesecond power converter 22 and transmits a driving signal S2 to thesecond power converter 22 to regulate the power output therefrom to thedriving device 23, thereby to control the rotational speed of theyarn conveying tray 20. Thedriving device 23 drives theyarn conveying tray 20 rotating based on the driving signal S2 so that thewarp yarns 30 wound on theyarn conveying tray 20 are supplied to theyarn feeder 12 at a desired yarn conveying speed. In this embodiment, output of theyarns 30 from theyarn conveying tray 20 is synchronous with input of theyarn feeder 12; namely, the yarn conveying speed of theyarns 30 on theyarn conveying tray 20 is the same as the yarn feeding speed of theyarn feeder 12. In the aforesaid embodiment, thecontrol unit 40 is electrically connected to thecircular knitting machine 10 and drivingdevice 23, or also can be independently connected to the drivingdevice 23, namely merely one driving signal S2 is output to the drivingdevice 23 to control the rotational speed of theyarn conveying tray 20. - Referring to
FIG. 3 , the yarn conveying speed of theyarns 30 on theyarn conveying tray 20 and yarn feeding speed of theyarn feeder 12 can be controlled instantly by users via thecontrol unit 40 or via preset operation parameters entered into thecontrol unit 40 in advance, thereby to set thecircular knitting machine 10 and drivingdevice 23 so that thecontrol unit 40 generates the yarn feeding signal S1 and the driving signal S2 and sends to thecircular knitting machine 10 and drivingdevice 23. Another alternative is providing a preset algorithm in thecontrol unit 40 to generate a driving signal S2 to drive theyarn conveying tray 20 rotating at the desired rotational speed according to a set yarn feeding signal S1 that controls the yarn feeding speed. - In order to stably control the tension of the
yarns 30 supplied to thecircular knitting machine 10, the yarn conveying system of the invention further includes at least oneyarn buffer device 50 on the yarn conveying path R of eachyarn 30 that is electrically connected to thecontrol unit 40 as shown inFIG. 2 . In this embodiment, referring toFIGS. 1 ,2 and4 , theyarn buffer device 50 mainly includes aframe 51 with a plurality of parallel movement tracks 52 located thereon, a movingelement 53 located on eachmovement track 52 and coupled on eachyarn 30, and at least one movement detection device to detect the positions of the movingelement 53. Theframe 51 has at least oneyarn eyelet 511 threaded through by theyarn 30 in a confined yarn conveying direction. Each movingelement 53 has at least one holdingportion 531 at one side. Themovement track 52 has asteel wire 521 threaded through the holdingportion 531 to move the movingelement 53 vertically. The movement detection device predetermines a movement detection range P corresponding to the positions of the movingelement 53, and includes afirst sensor 541 located at an upper limit of the movement detection range P and asecond sensor 542 located at a lower limit of the movement detection range P. The first andsecond sensors control unit 40. - When the tension of any
yarn 30 increases, the movingelement 53 coupled thereon is moved upwards on themovement track 52. In the event that the movingelement 53 moves beyond the upper limit of the movement detection range P and is detected by thefirst sensor 541, thefirst sensor 541 generates a second buffer signal S3 to thecontrol unit 40 which controls the drivingdevice 23 to increase the rotational speed of theyarn conveying tray 20. On the other hand, when the tension of anyyarn 30 decreases, the movingelement 53 coupled thereon is moved downwards on themovement track 52. In the event that the movingelement 53 moves beyond the lower limit of the movement detection range P and is detected by thesecond sensor 542, thesecond sensor 542 generates another second buffer signal S3 to thecontrol unit 40 which controls the drivingdevice 23 to decrease the rotational speed of theyarn conveying tray 20. To prevent too much tension difference betweendifferent yarns 30, when the first andsecond sensors elements 53 detect at the same time that the different movingelements 53 respectively moves beyond the upper and lower limits of the movement detection range P, a shut-down signal S4 is generated to thecontrol unit 40. - In addition, in order to detect the position of the moving
element 53 more precisely, the movement detection device also includes at least onethird sensor 543 between the first andsecond sensors third sensors 543 are arranged along the movement detection range P to get the position of the movingelement 53. Multiplethird sensors 543 detect the positions of different movingelements 53 and send the detected positions to thecontrol unit 40 which calculates an average position of all movingelements 53 and compares with an initial position stored therein, and then outputs the driving signal S2 to the drivingdevice 23 to regulate the rotational speed of theyarn conveying tray 20. - To avoid the circular knitting machine from rotating idly caused by broken yarns to result in defective finished fabric products, the yarn conveying system of the invention further includes a
broken yarn sensor 60 on theframe 51 of theyarn buffer device 50 corresponding to eachyarn 30 as shown inFIG. 4 . Thebroken yarn sensor 60 is electrically connected to thecontrol unit 40, and located below the movingelement 53, and can be triggered by the movingelement 53 to generate a shut-down signal S5 to thecontrol unit 40. - To summarize, the yarn conveying system for circular knitting machines of the present invention employs the yarn conveying tray used in the conventional shuttle loom to the circular knitting machine. The yarn conveying tray can actively supply multiple separate yarns via a driving device to the circular knitting machine to prevent the yarns from breaking caused by insufficient drawing force of the yarns to draw the yarn conveying tray during knitting operation. By providing the control unit that is electrically connected to the circular knitting machine and driving device of the yarn conveying tray to regulate the rotational speed of the yarn conveying tray, the yarn conveying speed of the yarns on the yarn conveying tray can be regulated to synchronize with the yarn feeding speed of the yarn feeder of the circular knitting machine. Moreover, to ensure the quality of finished fabric products, the yarn buffer device is provided on the yarn conveying path to detect the tension of the yarns and feed back a first buffer signal to the control unit based on the tension of the yarns to instantly regulate the rotational speed of the yarn conveying tray to maintain the tension of the yarns as desired. Thus the present invention provides significant improvements over the conventional techniques.
- While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
Claims (10)
- A yarn conveying system for a circular knitting machine, said circular knitting machine (10) including a needle cylinder (11) and at least one yarn feeder (12) arranged annularly on the needle cylinder (11); characterized by
at least one yarn conveying tray (20) configured to convey at least two separate yarns (30), said at least one yarn conveying tray (20) comprising a driving device (23) to drive the yarn conveying tray (20) to rotate to thereby supply the yarns (30) via a yarn conveying path (R) to an associated yarn feeder (12) of said circular knitting machine; and
a control unit (40) which is electrically connected to the driving device (23) and generates a driving signal (S2) sent to the driving device (23) to control rotational speed of the yarn conveying tray (20). - The yarn conveying system of claim 1, wherein the driving device (23) drives the respective yarn conveying tray (20) to rotate according to the driving signal (S2) so that the yarns (30) wound on the respective yarn conveying tray (20) are supplied to the associated yarn feeder (12) of said circular knitting machine at a selected yarn conveying speed, which is the same as a yarn feeding speed of the circular knitting machine (10).
- The yarn conveying system of claim 1 or 2, wherein the control unit (40) generates the driving signal (S2) based on a set yarn feeding speed to determine the rotational speed of the respective yarn conveying tray (20).
- The yarn conveying system of any of the preceding claims, further comprising at least one yarn buffer device (50) electrically connected to the control unit (40) on the yarn conveying path (R).
- The yarn conveying system of claim 4, wherein the yarn buffer device (50) outputs a first buffer signal based on tension of the yarns (30) on the yarn conveying path (R) to the control unit (40) to regulate the rotational speed of the respective yarn conveying tray (20) driven by the driving device (23).
- The yarn conveying system of claim 4 or 5, wherein the yarn buffer device (50) includes a moving element (53) coupled on each of the yarns (30) and at least one movement detection device to detect positions of the moving element (53), the movement detection device being electrically connected to the control unit (40).
- The yarn conveying system of claim 6, wherein the movement detection device predetermines a movement detection range (P) corresponding to the positions of the moving element (53) and includes a first sensor (541) located at an upper limit of the movement detection range (P) and a second sensor (542) located at a lower limit of the movement detection range (P); the first sensor (541) or the second sensor (542) generating a second buffer signal (S3) to the control unit (40) when the moving element (53) moves beyond the movement detection range (P).
- The yarn conveying system of claim 7, wherein the first sensors (541) and the second sensors (542) of different moving elements (53) generate a shut-down signal (S4) to the control unit (40) upon detecting the different moving elements (53) respectively moving beyond the upper limit and the lower limit of the movement detection range (P).
- The yarn conveying system of claim 7 or 8, wherein the movement detection device includes at least one third sensor (543) located between the first sensor (541) and the second sensor (542), multiple third sensors (543) detecting the positions of different moving elements (53) and sending the detected positions to the control unit (40), the control unit (40) calculating an average position of all moving elements (53) and comparing with an initial position stored therein to regulate the rotational speed of the yarn conveying tray (20) driven by the driving device (23).
- A circular knitting machine characterized by a yarn conveying system as claimed in any of the preceding claims.
Priority Applications (1)
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EP11191962.7A EP2602366A1 (en) | 2011-12-05 | 2011-12-05 | Yarn conveying system for circular knitting machines |
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EP11191962.7A EP2602366A1 (en) | 2011-12-05 | 2011-12-05 | Yarn conveying system for circular knitting machines |
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EP2602366A1 true EP2602366A1 (en) | 2013-06-12 |
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EP11191962.7A Withdrawn EP2602366A1 (en) | 2011-12-05 | 2011-12-05 | Yarn conveying system for circular knitting machines |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN109252281A (en) * | 2018-11-22 | 2019-01-22 | 青岛铭彩针织有限公司 | A kind of large circle machine send creel |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5388747A (en) * | 1993-06-03 | 1995-02-14 | Chen; Jen-Hui | Positive yarn feeding device |
US5423197A (en) * | 1991-09-26 | 1995-06-13 | Roser; Erich | Yarn-delivery device for yarn-consuming textile machines |
DE19500256A1 (en) * | 1994-01-07 | 1995-07-13 | Heimo Ojanperae | Round carpet weaving |
DE10003184A1 (en) * | 2000-01-25 | 2001-08-09 | Mayer Malimo Textilmaschf | Yarn/filament feed to a machine with an intermittent working cycle has an intermediate storage station in the path from the creel to lengthen and shorten a reserve loop according to demand |
-
2011
- 2011-12-05 EP EP11191962.7A patent/EP2602366A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5423197A (en) * | 1991-09-26 | 1995-06-13 | Roser; Erich | Yarn-delivery device for yarn-consuming textile machines |
US5388747A (en) * | 1993-06-03 | 1995-02-14 | Chen; Jen-Hui | Positive yarn feeding device |
DE19500256A1 (en) * | 1994-01-07 | 1995-07-13 | Heimo Ojanperae | Round carpet weaving |
DE10003184A1 (en) * | 2000-01-25 | 2001-08-09 | Mayer Malimo Textilmaschf | Yarn/filament feed to a machine with an intermittent working cycle has an intermediate storage station in the path from the creel to lengthen and shorten a reserve loop according to demand |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109252281A (en) * | 2018-11-22 | 2019-01-22 | 青岛铭彩针织有限公司 | A kind of large circle machine send creel |
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