CN108866785B - Elastic yarn feeding device in flat knitting machine - Google Patents
Elastic yarn feeding device in flat knitting machine Download PDFInfo
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- CN108866785B CN108866785B CN201810425310.6A CN201810425310A CN108866785B CN 108866785 B CN108866785 B CN 108866785B CN 201810425310 A CN201810425310 A CN 201810425310A CN 108866785 B CN108866785 B CN 108866785B
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- elastic yarn
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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
- D04B15/48—Thread-feeding devices
- D04B15/50—Thread-feeding devices for elastic threads
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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
- D04B15/46—Tensioning devices for individual threads for elastic threads
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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
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B7/00—Flat-bed knitting machines with independently-movable needles
- D04B7/04—Flat-bed knitting machines with independently-movable needles with two sets of needles
- D04B7/045—Flat-bed knitting machines with independently-movable needles with two sets of needles with stitch-length regulation
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
Abstract
The invention provides a yarn feeding device for an elastic yarn in a flat knitting machine, which can perform necessary yarn feeding considering the stretching and contraction of the elastic yarn in the knitting using the elastic yarn in the flat knitting machine. The feed mechanism of the flat knitting machine is controlled by comparing the magnitude of the entry tension of the elastic yarn entering the feed mechanism of the flat knitting machine with the magnitude of the knitting tension generated by the buffer arm and determining an appropriate correction amount based on the comparison result according to the correction parameter. The correction parameter has a correction amount by which the yarn amount of the elastic yarn increases when the entry tension is larger than the knitting tension and has a correction amount by which the yarn amount of the elastic yarn decreases when the entry tension is smaller than the knitting tension, the correction amount determining means determines an appropriate correction amount based on the correction parameter, and the control means controls the feeding mechanism using the correction amount determined by the correction amount determining means.
Description
Technical Field
The present invention relates to a yarn feeding device for an elastic yarn when knitting a knitting yarn using an elastic yarn having a large stretchability in a flat knitting machine.
Background
Conventionally, in knitting of underwear, socks, body protectors, sportswear, elastic garments for medical use, and the like, elastic yarns using fibers that stretch with high stretchability have been used. In a flat knitting machine for knitting these knitted fabrics, it is desired to perform knitting with a predetermined yarn amount while stabilizing the stitch length of the knitted fabric to be knitted. When the knitting courses are not knitted with a predetermined yarn amount, the knitted fabric has a difference in size, hand, tension, and the like.
As a conventional technique of a yarn feeding device for an elastic yarn in a loom, for example, the following publication is cited.
Patent document 1 (japanese patent No. 4016030) describes the following: based on knitting data, a necessary stitch length is obtained for each knitting needle, a knitting yarn is positively fed in synchronization with the movement of a carrier, and stitch density correction is performed by angular displacement of a buffer arm before and after knitting of a course.
However, in this invention, when the tension of the elastic yarn entering the yarn feeder is not constant, the elastic yarn fed by the active feed contracts or stretches, and therefore the yarn length of the elastic yarn fed to the yarn in the knitting course differs from the theoretical value. Thus, after the next course, if it is desired to make the yarn length in the knitting course a predetermined yarn length, the stitch density is corrected, but the correction is erroneous, and it is difficult to make the yarn amount of the elastic yarn close to the theoretical value.
In patent document 2 (japanese patent No. 2541574), a tension is applied to a knitting yarn using a guide arm, and the knitting yarn is preliminarily accumulated to cope with a rapid variation, so that the knitting yarn is positively fed out and the variation in yarn tension is suppressed. The guide arm detects the tension of the knitting yarn during knitting, and controls the motor to drive the yarn wheel as a preliminary accumulation in order to achieve a predetermined tension.
However, in this invention, the preliminary accumulation is formed by the yarn wheel, and therefore the apparatus becomes large. Further, since a difference occurs between the tension of the elastic yarn wound around the yarn wheel and the tension generated by the guide arm, the elastic yarn contracts or extends in the yarn feeding path, and thus cannot be supplied in a required amount. In addition, the yarn characteristics change regardless of the tension with which the elastic yarn is wound around the yarn wheel, and it is difficult to supply the elastic yarn exactly in a necessary amount.
[ Prior Art document ]
[ patent document ]
[ patent document 1 ] Japanese patent No. 4016030
[ patent document 2 ] Japanese patent No. 2541574
Disclosure of Invention
The invention provides a yarn feeding device for an elastic yarn in a flat knitting machine, which can perform necessary yarn feeding considering the expansion and contraction of the elastic yarn without enlarging the device in knitting using the elastic yarn in the flat knitting machine.
The present invention provides a yarn feeding device for elastic yarn in a flat knitting machine, comprising:
a feeding mechanism for feeding the elastic yarn to the yarn feeding member by using a roller based on knitting data used in the loom body;
a buffer arm which accumulates the yarn fed from the feeding mechanism in the middle and can freely swing;
a torque generator for applying torque to the buffer arm so that the knitting tension of the elastic yarn from the feeding mechanism to the yarn feeding member becomes a predetermined value; and
a control unit for calculating a theoretical value of a stitch length to be knitted by each knitting needle, controlling the feeding mechanism to feed the elastic yarn in synchronization with the operation of the yarn feeding member,
the yarn feeding device for elastic yarn in the flat knitting machine is characterized by comprising:
a tension sensor disposed on an upstream side of the roller and measuring a tension of the elastic yarn as an entry tension of the elastic yarn entering the roller;
a correction parameter for correcting the loop length to approach a theoretical value according to the yarn characteristics of the elastic yarn; and
a correction amount determining means for comparing the entry tension of the elastic yarn measured by the tension sensor with the knitting tension generated by the buffer arm and determining a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the correction parameter has a correction amount by which the yarn amount of the elastic yarn increases when the entry tension is larger than the knitting tension, and has a correction amount by which the yarn amount of the elastic yarn decreases when the entry tension is smaller than the knitting tension, the correction amount decision unit decides an appropriate correction amount based on the correction parameter,
the control means controls the feeding mechanism using the correction amount determined by the correction amount determination means.
In the present invention, the correction parameter includes a shrinkage parameter and a stretch parameter obtained from yarn characteristics of the elastic yarn, and the correction amount determination means determines the correction amount using the shrinkage parameter when the entry tension is greater than the knitting tension and determines the correction amount using the stretch parameter when the entry tension is less than the knitting tension.
In addition, the present invention is characterized in that an average value of entry tension values measured in a predetermined section is calculated and used with respect to the entry tension of the elastic yarn measured by the tension sensor.
In the present invention, the control means performs stitch density correction in the next course in order to absorb an error between the theoretical value in knitting of 1 course obtained from the angular displacement of the buffer arm after knitting of 1 course.
In the present invention, the correction amount determining means determines a difference between the entry tension of the elastic yarn measured by the tension sensor and the knitting tension generated by the buffer arm, determines a correction amount of the torque applied to the buffer arm so as to reduce the difference, compares the entry tension of the elastic yarn with the magnitude of the knitting tension, determines a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the control means adjusts the torque of the damper arm by the correction amount for the torque of the damper arm determined by the correction amount determination means, and controls the feed mechanism by using the correction amount for the feed mechanism.
[ Effect of the invention ]
As described above, in the present invention, in the knitting on the flat knitting machine using the elastic yarn, the entry tension of the elastic yarn entering the feeding mechanism of the flat knitting machine and the magnitude of the knitting tension generated by the buffer arm are compared, and based on the comparison result, an appropriate correction amount is determined based on the correction parameter, and the feeding mechanism is controlled. The correction parameter includes a correction amount by which the yarn amount of the elastic yarn increases when the entry tension is larger than the knitting tension and a correction amount by which the yarn amount of the elastic yarn decreases when the entry tension is smaller than the knitting tension, the correction amount determination means determines an appropriate correction value for the delivery mechanism based on a result of comparison between the entry tension and the knitting tension, and the control means controls the delivery mechanism according to the determined correction value, so that the yarn amount of the elastic yarn to be supplied can be brought close to a theoretical value.
In the present invention, the correction parameter includes a shrinkage parameter and a stretch parameter obtained from the yarn characteristics of the elastic yarn, and the correction is performed using the shrinkage parameter when the entry tension is greater than the knitting tension and the correction is performed using the stretch parameter when the entry tension is less than the knitting tension.
In the present invention, the average value of the tension values measured in the predetermined section is calculated for the measurement of the entry tension by the tension sensor, and therefore the tension value can be stabilized.
In the present invention, after knitting of 1 course, stitch density correction is performed in the next course in order to absorb an error from a theoretical value in knitting of 1 course based on a change in angle of the buffer arm before knitting of 1 course and after knitting of 1 course. Since the actual yarn amount error is obtained and the stitch density is corrected to absorb the error in the next course, the amount of the elastic yarn to be supplied can be made close to the theoretical value without being affected by the change in the knitting environment.
In the present invention, when there is a difference between the entry tension and the knitting tension, the correction amount determining means determines the correction amount for torque control of the buffer arm and the correction amount for control of the feed mechanism, and the control means performs both torque control of the buffer arm and control of the feed mechanism. This makes it possible to reduce the correction amounts for the torque control of the buffer arm and the feed control of the feed mechanism.
Drawings
Fig. 1 is a diagram showing a yarn feeding device and a weft knitting machine according to an embodiment.
Fig. 2 is a diagram showing the yarn characteristics of an elastic yarn.
FIG. 3 is a graph showing the shrinkage parameter and the stretch parameter in the examples.
FIG. 4 is a flowchart showing a yarn feeding process of an elastic yarn in the example.
[ Mark Specification ]
2 flat knitting machine body
4 yarn feeding device
6 trigonid sliding rack
8 needle bed
12 thread guide
14 elastic yarn
20 weave data
22 weave controller
28 servo motor
30 drive roller
32 driven roller
34 feeding mechanism
36 control unit
38 torque generator
40 buffer arm
44 degree sensor
46 tension sensor
48 correction amount determination unit
50 correction parameters
52 shrinkage parameter
54 tensile parameter
Detailed Description
The following shows an embodiment for carrying out the invention.
[ examples ] A method for producing a compound
< example 1 >
Fig. 1 shows a yarn feeding device for an elastic yarn in a weft knitting machine according to an embodiment. An embodiment is shown in which the yarn is fed from the left side of the flat knitting machine, but the yarn may be fed from above or from the right side. In the figure, 2 denotes a weft knitting machine main body, and 4 denotes a yarn feeder. In the embodiment, the yarn feeding device 4 and the weft knitting machine 2 are integrated, but the yarn feeding device 4 may be independent from the weft knitting machine body 2. Hereinafter, the weft knitting machine body 2 is simply referred to as a weft knitting machine 2. The flat knitting machine 2 includes a carriage 6 and a pair of front and rear needle beds 8, for example, and feeds an elastic yarn 14 to a knitting needle of the needle bed 8 by interlocking a carrier 12 as a yarn feeding member movable along a carrier rail 10 with the carriage 6, for example.
The carriage 6 selects which needle of the needle bed 8 is driven by the needle selector 16, and drives the needle selected by the cam 18 to perform knitting. Reference numeral 20 denotes knitting data, which is supplied to the flatbed knitting machine 2 from a LAN or USB memory, not shown. The knitting data 20 also includes pattern data of the knitted fabric, control data of the carriage 6 and the like. The knitting controller 22 extracts control data of the traveling motor 24 of the carriage 6, needle selection data and stitch density value of the knitting needles, interlock data of the carrier 12, and the like from the knitting data 20, and controls the flat knitting machine 2 to perform knitting.
The yarn feeding device 4 takes out the elastic yarn 14 from a package 26 disposed on the upper portion of the flat knitting machine 2, drives a driving roller 30 by a servo motor 28, and feeds and rewinds the elastic yarn 14 while being sandwiched between the driving roller 30 and a driven roller 32. The feed mechanism 34 is constituted by the servo motor 28, the drive roller 30, and the driven roller 32.
The control of the servo motor 28 is performed by a control unit 36. Reference numeral 38 denotes a torque generator which can generate a desired torque and is controlled by the control unit 36. The control unit 36 controls the torque generator 38 so that the elastic yarn 14 fed by the driving roller 30 and the driven roller 32 is at a desired tension (hereinafter referred to as a knitting tension) during knitting.
50 is a correction parameter, which stores a correction amount based on the yarn characteristics of the elastic yarn 14 to be used. As the correction parameters 50, 2 parameters of a shrinkage parameter 52 and a stretch parameter 54 are prepared.
Here, the yarn characteristics of the elastic yarn 14 will be explained.
In the present invention, the control of the feeding mechanism 34 is performed by determining an appropriate correction amount (correction parameter) so that the amount of the elastic yarn 14 to be fed approaches the theoretical value, but the yarn characteristics of the elastic yarn 14 to be used are required to obtain the correction parameter 50. The yarn characteristics of the elastic yarn 14 vary depending on the type of elastic yarn 14 to be used. Even the same type of elastic yarn 14 has different yarn characteristics depending on the lot, color, and the like. In order to make the amount of the elastic yarn 14 supplied close to the theoretical value, it is preferable to first obtain the yarn characteristics of the elastic yarn actually used.
As a method for obtaining the yarn characteristics of the elastic yarn 14, the yarn characteristics are measured using an automatic yarn traction tester or the like. The yarn characteristics required here are elongation characteristics, and after the elastic yarn 14 having a predetermined length (for example, 10cm or 20 cm) is gradually pulled from a state where the tension is 0 until a predetermined tensile tension is reached, the pulling tension applied to the elastic yarn 14 is gradually changed until the pulling tension is 0, and the relationship between the tension for both pulling and shortening the elastic yarn 14 and the length of the elastic yarn 14 at that time is obtained.
The table shown in fig. 2 is an example of the yarn characteristics of the elastic yarn 14. The portion with the traction tension of 20gf to 30gf is described by drawing out, but actually the measurement is performed in a wider range. The elastic yarn 14 has a characteristic that the elastic yarn 14 after one-degree elongation does not return to its original length due to the influence of hysteresis. Therefore, as is clear from fig. 2, even with the same drawing tension, the elongation and shrinkage rate differ between the case of stretching and the case of shrinking the elastic yarn 14.
The yarn characteristics may be obtained manually without using an automatic traction tester, or in fig. 1, the elastic yarn 14 is fixed by providing a jig for fixing the elastic yarn 14 upstream of the tension sensor 46, the drive roller 30 of the feeding mechanism 34 is driven in this state, the elastic yarn 14 is fed out, the tension is measured, and then the elastic yarn 14 is wound back and the tension is measured, whereby the yarn characteristics can be obtained on the loom.
Next, the contraction parameter 52 and the extension parameter 54 of the correction parameters 50 will be described.
Fig. 3(1) is a table showing an example of the contraction parameter 52. This is obtained by determining the correction amount of the delivery mechanism 34 for each range of the entry tension in consideration of the shrinkage rate of the elastic yarn 14 when the elastic yarn 14 shrinks, based on the yarn characteristics of the elastic yarn 14 shown in fig. 2. The contraction parameter 52 is used in the event that the entry tension of the elastic yarn 14 detected by the tension sensor 46 is greater than the weave tension generated by the buffer arm 40. That is, since the tension applied to the elastic yarn 14 is reduced and contracted after the elastic yarn 14 is fed by the feeding mechanism 34, in order to make the yarn amount of the elastic yarn 14 approach the theoretical value, the feeding mechanism 34 is corrected to operate in the normal direction using the contraction parameter 52, and the feeding amount of the elastic yarn 14 is increased. For example, when the theoretical value of the elastic yarn 14 in the needle pitch is 8mm and the correction amount is determined to be + 2%, the feeding mechanism 34 is controlled to feed the elastic yarn 14 of 8.16 mm.
Fig. 3(2) is a table showing an example of the stretching parameters 54. This is obtained by determining the correction amount of the delivery mechanism 34 for each range of the entry tension in consideration of the stretch ratio of the elastic yarn 14 when the elastic yarn 14 is stretched from the yarn characteristics of the elastic yarn 14 shown in fig. 2. The stretch parameter 54 is used when the entry tension of the elastic yarn 14 detected by the tension sensor 46 is less than the weave tension created by the buffer arm 40. That is, since the tension applied to the elastic yarn 14 is increased and the elastic yarn 14 is stretched after the elastic yarn 14 is fed by the feeding mechanism 34, the amount of the elastic yarn 14 to be fed is reduced by correcting the feeding mechanism 34 to operate in the negative side using the stretch parameter 54 so that the yarn amount of the elastic yarn 14 approaches the theoretical value. For example, in the case where the theoretical value of the elastic yarn 14 in the needle pitch is 8mm and the correction amount is determined to be-2%, the feeding mechanism 34 is controlled to feed 7.84mm of the elastic yarn 14.
The yarn feeding process of the elastic yarn 14 during knitting will be described with reference to the flowchart of fig. 4.
First, the process is started in step S1. In step S2, the tension sensor 46 is used to measure the entry tension of the elastic yarn 14 before it enters the feeding mechanism 34. The tension sensor 46 measures the tension of the elastic yarn 14 at every 1ms, for example, in a predetermined interval of the knitted course. If the measurement of the tension in the predetermined section is finished, the average tension in the section is calculated. This can obtain an entry tension with high accuracy.
Note that, although the predetermined section of the knitted course may be 1 course, it is preferable that, for example, a portion other than the knitted-in section and the knitted-out section is the predetermined section because the tension of the elastic yarn 14 is unstable in the knitted-in (knitted-in り) section and the knitted-out (knitted-out) section of the knitted course. Further, for example, the average value of the tensions obtained in the predetermined section is obtained every 2 to 3 courses, and if these tension values are averaged, more stable knitting can be realized.
The measurement of the entry tension, the determination of the correction amount by the correction amount determination means 48, and the like are performed at the time of knitting an actual knitted product, but even at the time of execution of a stitch length routine performed for stitch cam positioning before actual knitting, the feed amount can be corrected from the 1 st course at the time of actual knitting by performing the measurement of the entry tension, the determination of the correction amount by the correction amount determination means 48, and the like.
Next, in step S3, the knitting tension is acquired. The knitting tension is determined by the torque applied to the buffer arms 40 by the torque generator 38. In the present embodiment, the torque applied to the buffer arm 40 is set so that the knitting tension is fixed to, for example, 20gf or 25 gf. The knitting tension may be determined in accordance with the characteristics of the elastic yarn 14 to be used or the knitted product to be knitted. The knitting tension may be variable depending on the knitting-in, knitting-out, knitting position, and the like without being fixed.
In step S4, the magnitudes of the entry tension in step S2 and the knitting tension in step S3 are compared. If the entry tension is greater than the knitting tension in step S5, the process proceeds to step S6. In step S6, since the tension decreases and the elastic yarn 14 contracts when it passes over the feed mechanism 34, the correction amount determination means 48 determines the correction amount of the feed mechanism 34 corresponding to the entry tension using the contraction parameter 52 of the correction parameter 50. Then, the process proceeds to step S7, and the control unit 36 controls the feeding mechanism 34 using the determined correction amount.
In step S9, if the entry tension is smaller than the knitting tension, the process proceeds to step S10. In step S10, since the tension increases and the elastic yarn 14 is stretched when it exceeds the feed mechanism 34, the correction amount determination means 48 determines the correction amount of the feed mechanism 34 corresponding to the entry tension using the stretch parameter 54 of the correction parameter 50. Then, the process proceeds to step S7, and the control unit 36 controls the feeding mechanism 34 by the determined correction amount.
Step S11 is a case where the entry tension and the knitting tension are the same, and the correction parameter 50 does not need to be used intentionally. The process then proceeds to step S7, where the control of the feeding mechanism 34 is performed without correction. The process finally proceeds to step S8, and the process ends.
The angular displacement of the damping arm 40 can be detected by the angle sensor 44. The error between the theoretical value of the yarn amount of the elastic yarn 14 used in 1 course and the yarn amount of the elastic yarn 14 actually used can be obtained from the difference between the angle of the buffer arm 40 before knitting in 1 course and the angle of the buffer arm 40 after knitting in 1 course. The angle of the buffer arm 40 before knitting of 1 course can be matched to a predetermined angle by the release and rewinding of the elastic yarn 14 by the delivery mechanism 34.
After knitting of 1 course, an error in the yarn amount from the theoretical value is calculated, and the stitch density is corrected in the next course so as to absorb the error. This enables the yarn length of the elastic yarn 14 to be closer to the theoretical value.
< example 2 >
In the present embodiment, a case will be described in which both the torque control of the buffer arm 40 and the control of the feed mechanism 34 are performed when there is a difference between the magnitude of the entry tension and the magnitude of the knitting tension.
First, the correction amount determining means 48 compares the entry tension of the elastic yarn 14 measured by the tension sensor 46 with the knitting tension generated by the buffer arm 40, and obtains a correction amount for torque control of the buffer arm 40 so as to reduce the difference. In accordance with the correction amount, the control unit 36 controls the torque generator 38 to control the torque of the damper arm 40. However, if the torque of the buffer arm 40 is changed greatly, the knitting tension changes for each course, and therefore it is not preferable to change the torque of the buffer arm 40 greatly. Therefore, not only the torque control of the buffer arm 40 is performed, but also the correction amount determination means 48 determines the correction amount for controlling the feed mechanism 34 by comparing the magnitudes of the entry tension and the knitting tension as in embodiment 1. In this case, the correction amounts for the torque control of the buffer arm 40 and the conveyance control of the delivery mechanism 34 can be reduced.
In the above-described embodiment, it has been described that the yarn characteristics are preferably obtained for the elastic yarn 14 actually used, but the already obtained yarn characteristics of the elastic yarn 14 may be used as desired when the lot of the elastic yarn 14 is the same or when the yarn amount is allowed to vary slightly.
Claims (9)
1. An elastic yarn feeding device in a weft knitting machine, comprising:
a feeding mechanism for feeding the elastic yarn to the yarn feeding member by using a roller based on knitting data used in the loom body;
a buffer arm which accumulates the yarn fed from the feeding mechanism in the middle and can freely swing;
a torque generator for applying torque to the buffer arm so that the knitting tension of the elastic yarn from the feeding mechanism to the yarn feeding member becomes a predetermined value; and
a control unit for calculating a theoretical value of a stitch length to be knitted by each knitting needle, controlling the feeding mechanism to feed the elastic yarn in synchronization with the operation of the yarn feeding member,
the yarn feeding device for elastic yarn in the flat knitting machine is characterized by comprising:
a tension sensor disposed on an upstream side of the roller and measuring a tension of the elastic yarn as an entry tension of the elastic yarn entering the roller;
a correction parameter for correcting the loop length to approach a theoretical value according to the yarn characteristics of the elastic yarn; and
a correction amount determining means for comparing the entry tension of the elastic yarn measured by the tension sensor with the knitting tension generated by the buffer arm and determining a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the correction parameter has a correction amount by which the yarn amount of the elastic yarn increases when the entry tension is larger than the knitting tension, and has a correction amount by which the yarn amount of the elastic yarn decreases when the entry tension is smaller than the knitting tension, the correction amount decision unit decides an appropriate correction amount based on the correction parameter,
the control means controls the feeding mechanism using the correction amount determined by the correction amount determination means.
2. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 1,
the correction parameters have a shrinkage parameter and a stretch parameter determined from the yarn characteristics of the elastic yarn,
the correction amount determining means determines the correction amount using the shrinkage parameter when the entry tension is larger than the knitting tension, and determines the correction amount using the stretch parameter when the entry tension is smaller than the knitting tension.
3. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 1 or 2,
the entry tension of the elastic yarn measured by the tension sensor is calculated and used as an average value of entry tension values measured in a predetermined interval.
4. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 1 or 2,
the control means performs stitch density correction in the next course in order to absorb an error between a theoretical value of the yarn amount of the elastic yarn used for knitting in 1 course and the yarn amount of the elastic yarn actually used, which is obtained from the angular displacement of the buffer arm after knitting in 1 course.
5. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 3,
the control means performs stitch density correction in the next course in order to absorb an error between a theoretical value of the yarn amount of the elastic yarn used for knitting in 1 course and the yarn amount of the elastic yarn actually used, which is obtained from the angular displacement of the buffer arm after knitting in 1 course.
6. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 1 or 2,
the correction amount determining means determines a difference between the entry tension of the elastic yarn measured by the tension sensor and the knitting tension generated by the buffer arm, determines a correction amount of the torque applied to the buffer arm so as to reduce the difference, compares the entry tension of the elastic yarn with the magnitude of the knitting tension, and determines a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the control means adjusts the torque of the damper arm by the correction amount for the torque of the damper arm determined by the correction amount determination means, and controls the feed mechanism by using the correction amount for the feed mechanism.
7. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 3,
the correction amount determining means determines a difference between the entry tension of the elastic yarn measured by the tension sensor and the knitting tension generated by the buffer arm, determines a correction amount of the torque applied to the buffer arm so as to reduce the difference, compares the entry tension of the elastic yarn with the magnitude of the knitting tension, and determines a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the control means adjusts the torque of the damper arm by the correction amount for the torque of the damper arm determined by the correction amount determination means, and controls the feed mechanism by using the correction amount for the feed mechanism.
8. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 4,
the correction amount determining means determines a difference between the entry tension of the elastic yarn measured by the tension sensor and the knitting tension generated by the buffer arm, determines a correction amount of the torque applied to the buffer arm so as to reduce the difference, compares the entry tension of the elastic yarn with the magnitude of the knitting tension, and determines a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the control means adjusts the torque of the damper arm by the correction amount for the torque of the damper arm determined by the correction amount determination means, and controls the feed mechanism by using the correction amount for the feed mechanism.
9. The yarn feeding device of an elastic yarn in a weft knitting machine according to claim 5,
the correction amount determining means determines a difference between the entry tension of the elastic yarn measured by the tension sensor and the knitting tension generated by the buffer arm, determines a correction amount of the torque applied to the buffer arm so as to reduce the difference, compares the entry tension of the elastic yarn with the magnitude of the knitting tension, and determines a correction amount for the feeding mechanism based on the comparison result and the correction parameter,
the control means adjusts the torque of the damper arm by the correction amount for the torque of the damper arm determined by the correction amount determination means, and controls the feed mechanism by using the correction amount for the feed mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-092655 | 2017-05-08 | ||
| JP2017092655A JP6498232B2 (en) | 2017-05-08 | 2017-05-08 | Yarn feeder for elastic yarn in flat knitting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108866785A CN108866785A (en) | 2018-11-23 |
| CN108866785B true CN108866785B (en) | 2020-04-10 |
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| CN201810425310.6A Active CN108866785B (en) | 2017-05-08 | 2018-05-07 | Elastic yarn feeding device in flat knitting machine |
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|---|---|
| EP (1) | EP3401428B1 (en) |
| JP (1) | JP6498232B2 (en) |
| KR (1) | KR101954658B1 (en) |
| CN (1) | CN108866785B (en) |
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| CN110760989B (en) * | 2019-11-08 | 2021-01-26 | 西安工程大学 | Flat knitting machine spandex yarn controller |
| CN111607890B (en) * | 2020-05-29 | 2022-02-15 | 江南大学 | Weaving method of bare ammonia plated flat knitted fabric and yarn feeding device thereof |
| CN113584704B (en) * | 2021-08-20 | 2022-12-02 | 针知运纺织科技(上海)有限公司 | Weft insertion yarn guide system of computer flat knitting machine |
| CN114164551A (en) * | 2021-12-16 | 2022-03-11 | 桐乡市桐诚科技有限公司 | Computerized flat knitting machine yarn feeding detection device and yarn feeding control method thereof |
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| DE3627731C1 (en) | 1986-08-16 | 1988-03-31 | Gustav Memminger | Thread delivery device with electronic thread tension control |
| AU7513996A (en) * | 1995-10-12 | 1997-04-30 | E.I. Du Pont De Nemours And Company | Process and apparatus for knitting fabric with non-elastic yarn and bare elastomeric yarn and sweater knit fabric construction |
| JP3603031B2 (en) | 2001-01-31 | 2004-12-15 | 株式会社島精機製作所 | Yarn feeding device |
| CN100390343C (en) * | 2002-07-24 | 2008-05-28 | 株式会社岛精机制作所 | Yarn feeding device for flat knitting machine |
| JP4489702B2 (en) * | 2003-04-18 | 2010-06-23 | 株式会社島精機製作所 | Knitting method and apparatus using elastic yarn |
| EP2080828B1 (en) | 2006-09-15 | 2012-11-14 | Shima Seiki Mfg., Ltd | Method of measuring elastic characteristics of kitting yarn and knitting machine |
| CN101981241B (en) * | 2008-03-07 | 2012-07-18 | 株式会社岛精机制作所 | Apparatus and method for knitting fabric using elastic yarns |
| CN102131971B (en) | 2008-08-22 | 2012-11-21 | 株式会社岛精机制作所 | Flat knitting machine |
-
2017
- 2017-05-08 JP JP2017092655A patent/JP6498232B2/en active Active
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2018
- 2018-05-03 KR KR1020180051112A patent/KR101954658B1/en active IP Right Grant
- 2018-05-07 CN CN201810425310.6A patent/CN108866785B/en active Active
- 2018-05-07 EP EP18171107.8A patent/EP3401428B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP6498232B2 (en) | 2019-04-10 |
| EP3401428B1 (en) | 2020-06-10 |
| KR20180123442A (en) | 2018-11-16 |
| EP3401428A1 (en) | 2018-11-14 |
| JP2018188771A (en) | 2018-11-29 |
| KR101954658B1 (en) | 2019-03-06 |
| CN108866785A (en) | 2018-11-23 |
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