CN106245212B - Method and device for controlling the consumption rate of a yarn unwound from an accumulating feeder to a textile machine - Google Patents
Method and device for controlling the consumption rate of a yarn unwound from an accumulating feeder to a textile machine Download PDFInfo
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- CN106245212B CN106245212B CN201610409259.0A CN201610409259A CN106245212B CN 106245212 B CN106245212 B CN 106245212B CN 201610409259 A CN201610409259 A CN 201610409259A CN 106245212 B CN106245212 B CN 106245212B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
- B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
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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
- D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
- D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
- D04B35/12—Indicating, warning, or safety devices, e.g. stop motions responsive to thread consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Looms (AREA)
Abstract
The present disclosure relates to a method and apparatus for controlling the rate of consumption of a unwound yarn from an accumulating feeder to a textile machine. The yarn tension is stabilized at a reference tension (T _ ref) by a fabric brake device (20) which is driven by a Control Unit (CU) receiving a measured tension signal (T _ meas) from a tension sensor (22). The yarn consumption rate (YS meas) is continuously measured and continuously compared with a reference rate (YS ref). If the difference between the yarn consumption rate (YS _ meas) and the reference rate (YS _ ref) falls within a predetermined error range, which indicates that the machine is operating at constant consumption, the reference tension (T _ ref) is adjusted so as to minimize the difference between the yarn consumption rate (YS _ meas) and the reference rate (YS _ ref), otherwise the adjustment of the reference tension (T _ ref) is inhibited.
Description
Technical Field
The present invention relates to a method for controlling the consumption rate (m/sec) of unwinding a yarn from an accumulation feeder (accumulating feeder) towards a textile machine, in particular a circular knitting machine, and to a device for performing such a method.
Background
As is known, a typical circular knitting machine may be fed by a plurality of yarns unwound from respective yarn feeders, known as "accumulator feeders".
A typical accumulator yarn feeder includes a drum (drum) on which a winding mechanism winds a plurality of yarn loops forming a store. Such a winding mechanism may consist of a motorized flywheel that winds the yarn onto a drum, or the drum itself may be rotated in order to wind the yarn onto it. The yarn is taken from an upstream take-up reel (distaff) and delivered to a downstream textile machine according to the requests of the latter.
EP2031106B1 discloses how the yarn tension unwinding from the drum is controlled so as to keep it substantially constant. For this purpose, a tension sensor arranged downstream of the supply machine detects the yarn tension and sends it to the control unit. The control unit drives in feedback the mechanism for braking the yarn in order to stabilize the tension on the preset value.
As is known, some applications also require that the machine always receives the same amount of yarn over time. However, such a requirement conflicts with the regulation of the yarn tension, since regulating the braking changes the rate at which the yarn is transferred to the machine and, therefore, the consumption of yarn.
In order to solve such drawbacks, it is known, where possible, to measure the amount of yarn unwound by the feeder and to adjust the "knitting triangle" (i.e. the stroke of the needles) of the textile machine accordingly, in order to compensate for the yarn speed variations.
However, such a solution is not applicable on large diameter knitting machines due to cost and burden reasons, considering the large number of knitting triangle controllers that will be needed. In these machines, therefore, the yarn tension is controlled only, for example, by the method disclosed in EP2031106B1 mentioned above.
In large diameter jacquard knitting machines where yarn consumption is continuously adjusted (up to 30-50%) to provide complex patterns, the lack of control over the yarn consumption rate does not cause problems, as the pattern hides any defects due to uncontrolled consumption.
However, some types of braiding alternate variable consumption steps with constant consumption steps. The lack of control over the yarn consumption rate in the knitting step with constant consumption produces defects in the form of "stripes" on the finished garment.
Furthermore, the above solution is not applicable to older or cheaper knitting machines (for example machines for stockings) which do not allow adjustment of the knitting triangle.
However, as is known, the regulation of the yarn consumption rate would also be desirable on these machines, in particular in the knitting step with constant consumption, in order to eliminate the defects in the garment and in particular to ensure the repeatability of the dimensions between one garment and the next.
Disclosure of Invention
It is therefore an object of the present invention to provide a method for controlling the consumption rate of yarn unwound from an accumulation feeder to a textile machine, which can be practically and economically employed, including for existing knitting machines without adjustment of the knitting triangle, in particular for large-diameter knitting machines and machines for stockings, and to provide a device for implementing the method.
The above objects and other advantages, which will become more apparent from the ensuing description, are achieved by a method having the features specified in this application and an apparatus having the features specified in this application, while this application also defines other features of the invention which are advantageous, though minor.
Drawings
The invention will now be described in more detail with reference to a preferred but not exclusive embodiment thereof, shown for the purpose of non-limiting example in figure 1, figure 1 being a schematic view of a textile machine receiving a yarn from an accumulation feeder by means of a method according to the invention.
Detailed Description
With reference to fig. 1, a textile machine fabric feeder (wet feeder)10 comprises a stationary drum 12 and a flywheel 14, the flywheel 14 being driven by a motor 15 to take a yarn F from a take-up reel 16 and wind it on the drum 12 in the form of a loop forming a reserve. The yarn F is unwound from the drum 12 upon request from a downstream general textile machine, advantageously a circular knitting machine 17.
The amount of stock on the drum 12 is controlled by a triplet of sensors. A first sensor S1, preferably a Hall probe, detects the passage of a magnet (e.g., M) integral with the flywheel 14 to determine the amount of yarn wound on the drum and the winding rate. A second sensor S2 (preferably a mechanical sensor) provides a binary item of information about the presence or absence of a minimum reserve at the mid-zone of the drum 12. A third sensor S3 (preferably an optical sensor) generates a pulse UWP for each yarn loop unwound from the drum.
Arranged downstream of the fabric feed machine 10 is a fabric braking device (20) driven by a control unit CU programmed to stabilize the yarn tension unwound from the drum 12 at a preset value through a feedback control loop.
For this purpose, arranged downstream of the fabric brake device 20 is a tension sensor 22, which tension sensor 22 is adapted to measure the tension of the yarn F unwound from the drum and to generate a corresponding measured tension signal T meas.
The control unit CU comprises a tension control block CT programmed to compare the measured tension signal T meas with a reference tension T ref representing the desired tension and to generate therefore a braking signal BI for the fabric braking device 20, for example in order to minimize the difference between the measured tension and the reference tension.
In a manner conventional per se, the control unit CU of the supply machine is connected to the knitting machine 17 by means of a bus 30 for the interchange of information, such as the speed of the machine, alarms, status and settings of parameters.
There are also systems for detecting accidental stops of the yarn.
In particular, under normal operating conditions, the supply machine 10 receives pulses UWP from sensor S3 for each turn unwound from the drum 12. Since the yarn draw-off rate at a given rotational speed of the downstream machine is almost constant, the interval between successive pulses will vary only to a negligible extent under normal conditions. But if the time elapsed since the last pulse clearly exceeds the average interval, the machine will shut down due to the possibility that the fabric has experienced an accidental stop, either due to breakage of the yarn or due to loss of yarn by the needles of the machine 17. For more details about such a system for detecting an accidental stop of the yarn, which is outside the aim and object of the present invention, reference is made to EP2031106B 1.
In order to exactly stabilize the yarn consumption rate in the step in which the machine operates at constant consumption, the method according to the invention is applied, which comprises the following steps:
continuously measuring the consumption rate YS meas of the yarn drawn by the machine 17,
-continuously comparing the consumption rate YS _ meas with a reference rate YS _ ref,
-if the difference between the consumption rate YS _ meas and the reference rate YS _ ref falls within a predetermined error range, which indicates that the machine is operating at constant consumption, adjusting the reference tension T _ ref so as to minimize the difference between the consumption rate YS _ meas and the reference rate YS _ ref, otherwise disabling the adjustment of the reference tension T _ ref.
Thus, control of the consumption rate is automatically disabled in steps in which the machine operates at variable consumption in order to produce complex patterns (when control of the consumption rate is essentially irrelevant) and it is enabled again when the machine operates at constant consumption in order to produce smooth knitting (when control of the consumption rate is of utmost importance in order to prevent "stripes" or dimensional variations in the finished garment).
The consumption rate YS _ meas can advantageously be calculated as the average of the unwinding speeds of the respective feeders for the yarn. For each feeder, such unwinding speed can be calculated by the speed estimation block SE from the UWP pulse originating from the third sensor S3.
Preferably, the maximum allowable error YS _ err delimiting the ends of the interval of errors in modulus is established in terms of a percentage, for example 5% -10%, but it can also be established in terms of a difference.
A comparison between the consumption rate YS _ meas and the reference rate YS _ ref is performed in the speed regulator block YSR, which then generates an output signal YSR _ out. Such an output signal YSR _ out is sent to the input of the reference tension T _ ref of the tension control block CT via the switch YSRs. The switch YSRs is closed only if the difference between the measured consumption rate YS _ meas and the reference rate YS _ ref falls within a predetermined error range by a reactivation signal YSRs _ en generated by the speed regulator block YSR.
Preferably, the adjustment range of the reference pulling force is delimited between two preset maximum values YS _ T _ ref _ min and YS _ T _ ref _ max.
Furthermore, advantageously, the method comprises an alarm process which stops the machine if the feeding under the limiting tension condition (YS _ T _ ref _ min or YS _ T _ ref _ max) lasts more than a preset maximum time.
Also preferably, the method includes a further warning process which stops the machine if the consumption rate YS _ meas does not converge to a value close to the reference rate YS _ ref within a preset maximum time.
The above-described alarm process makes it possible to verify whether an anomaly has occurred during the yarn feed or whether the operating parameters have changed completely.
The reference tension T _ ref preferably corresponds, in the step in which the machine operates at variable consumption, to the most recent output signal YSR _ out set by the speed regulator block YSR.
Alternatively, the reference tension T _ ref may be set to a fixed value selected by the user.
As a further alternative, the fabric brake device 20 can be locked in the most recently adjusted position of the tension controller CT.
If the machine is served by a plurality of yarn feeders, the reference velocity YS _ ref is advantageously calculated by a calibration procedure comprising the following steps:
disable the consumption control loop (i.e. switch YSRS is locked in the open position),
-setting the same reference tension T _ ref on all feeders,
-starting the machine in a section where the machine operates at constant consumption,
-interrogating each yarn feeder to obtain a corresponding yarn unwinding speed YS _ meas _ i, wherein the index i identifies the i-th feeder, which corresponding yarn unwinding speed YS _ meas _ i is calculated by a speed estimation block SE from UWP pulses originating from a third sensor S3,
-calculating the reference speed YS _ ref as the arithmetic mean of the yarn unwinding speeds of all feeders,
-setting each feeder to the reference speed YS _ ref thus calculated,
-re-enabling the consumption control loop.
Further, the reference rate YS _ ref may be continuously updated according to the speed of the machine by the following formula:
YS_ref_upd＝(Y_ref_nom*V_mach)/V_mach_nom
where YS _ ref _ upd is the updated reference rate, Y _ ref _ nom is the nominal reference rate (e.g., the reference rate calculated by the calibration procedure shown above), V _ macro is the speed of the machine, and V _ macro _ nom is the nominal speed of the machine, i.e., the measured speed of the machine under nominal conditions (e.g., the measured speed of the machine during the calibration procedure shown above).
The speed of the machine as indicated above is provided to the control unit CU via the bus 30.
The preferred embodiments of the present invention have been described, but it is apparent that those skilled in the art can make various modifications and changes within the scope of the appended claims.
For example, assuming that the amount of yarn unwound from the drum is equal to the amount of yarn wound on the drum during operation at constant speed, the yarn consumption rate Y _ meas _ i of the i-th feeder may be calculated on the basis of the pulses generated by the first sensor S1 instead of the third sensor S3.
Claims (10)
1. A method for controlling the consumption rate of unwinding a yarn from an accumulating feeder to a textile machine, wherein the yarn tension is stabilized at a reference tension (T _ ref) by a fabric brake device (20), said fabric brake device (20) being driven by a Control Unit (CU) receiving a measured tension signal (T _ meas) from a tension sensor (22),
characterized in that it comprises the following steps:
-continuously measuring the yarn consumption rate (YS _ meas),
-continuously comparing the yarn consumption rate (YS _ meas) with a reference rate (YS _ ref),
-if the difference between said yarn consumption rate (YS _ meas) and said reference rate (YS _ ref) falls within a predetermined error range, which indicates that the textile machine is operating at constant consumption, adjusting said reference tension (T _ ref) so as to minimize the difference between said yarn consumption rate (YS _ meas) and said reference rate (YS _ ref), otherwise disabling said adjustment of said reference tension (T _ ref), said yarn consumption rate being calculated from pulses originating from a sensor (S3), said sensor (S3) being provided on said accumulating feed machine and generating pulses (UWP) for each unwound loop,
wherein the comparison between the yarn consumption rate (YS _ meas) and the reference rate (YS _ ref) is performed in a speed regulator block (YSR), which then generates an output signal (YSR _ out), which is sent to the input of the reference tension (T _ ref) of the tension control block (TC) by means of a switch (YSRs), and the switch (YSRs) is closed only if the difference between the yarn consumption rate (YS _ meas) and the reference rate (YS _ ref) falls within the predetermined error range by means of a reactivation signal (YSRs _ en) generated by the speed regulator block (YSR).
2. Method according to claim 1, characterized in that the adjustment of the reference tension (T _ ref) is defined between two preset values (YS _ T _ ref _ min, YS _ T _ ref _ max).
3. Method as in claim 2, characterized in that said textile machine is stopped if the feed under tension equal to one of said preset values lasts more than a preset maximum time.
4. Method according to claim 1, characterized in that the textile machine is stopped if the yarn consumption rate (YS meas) does not converge to a value close to the reference rate (YS ref) within a preset maximum time.
5. Method according to claim 1, characterized in that when the adjustment of the reference tension (T _ ref) is inhibited, the reference tension (T _ ref) is set to a fixed value corresponding to the most recently adjusted tension value.
6. Method according to claim 1, characterized in that when the regulation of the reference tension (T _ ref) is inhibited, the reference tension (T _ ref) is set to a fixed value selected by the user.
7. Method according to claim 1, characterized in that the fabric brake device (20) is locked in the most recently adjusted position when the adjustment of the reference tension (T _ ref) is inhibited.
8. Method according to claim 1, characterized in that the reference rate (YS _ ref) is calculated by a calibration procedure comprising the following steps:
-disabling said regulation of said reference tension (T _ ref),
-setting the same reference tension (T _ ref) for each of the accumulated feeders feeding the textile machine (17),
-starting the textile machine (17) in a portion in which it operates at constant consumption,
-requesting from each of said accumulation feeders a respective yarn unwinding speed (YS _ meas _ i),
-calculating said reference speed (YS _ ref) as the arithmetic mean of the yarn unwinding speeds of all said accumulated feeder machines.
9. Method according to claim 1, characterized in that the reference rate (YS _ ref) is continuously updated from the speed of the textile machine by the following formula:
YS_ref_upd＝(Y_ref_nom*V_mach)/V_mach_nom
wherein YS _ ref _ upd is the updated reference speed, Y _ ref _ nom is the nominal reference speed, V _ map is the measured speed of the textile machine, and V _ map _ nom is the nominal speed of the textile machine.
10. An accumulation feeder (10) comprising at least a sensor (S3) and a device for controlling the consumption rate of unwinding yarn from said accumulation feeder (10) to a textile machine (17), said device comprising a fabric braking device (20) driven by a tension control block (TC) programmed to stabilize the yarn tension (T meas) measured by a tension sensor (22) on a reference tension (T ref), characterized in that it comprises:
-a rate estimation block (SE) configured for continuously calculating said consumption rate (YS _ meas),
-a speed regulator block (YSR) adapted to continuously compare said yarn consumption rate (YS _ meas) with a reference rate (YS _ ref) and to generate therefrom an output signal (YSR _ out) for input of said reference tension (T _ ref) of said tension control block (TC) adapted to minimize the difference between said yarn consumption rate and said reference rate,
-a switch (YSRS) interposed between said output signal (YSR _ out) and said input of said reference tension (T _ ref), said switch (YSRS) being driven closed only if the difference between said yarn consumption rate (YS _ meas) and said reference rate (YS _ ref) falls within a predetermined error range, which indicates the fact that the textile machine is operating at constant consumption, wherein said rate estimation block (SE) is configured to calculate said yarn consumption rate (YS _ meas) from pulses originating from said sensor (S3), said sensor (S3) being provided on said accumulating feed machine and generating a pulse (UWP) for each yarn loop unwound, and said rate estimation block (SE) sending the calculated yarn consumption rate (YS _ meas) to said speed regulator block (YSR).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITUB20151048 | 2015-06-12 | ||
| IT102015000023117 | 2015-06-12 |
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| Publication Number | Publication Date |
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| CN106245212A CN106245212A (en) | 2016-12-21 |
| CN106245212B true CN106245212B (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610409259.0A Active CN106245212B (en) | 2015-06-12 | 2016-06-12 | Method and device for controlling the consumption rate of a yarn unwound from an accumulating feeder to a textile machine |
Country Status (2)
| Country | Link |
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| EP (1) | EP3103749B1 (en) |
| CN (1) | CN106245212B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201700113434A1 (en) * | 2017-10-10 | 2019-04-10 | Lgl Electronics Spa | METHOD OF CHECKING YARN CONSUMPTION IN A WEAVING PROCESS |
| CN109626126B (en) * | 2019-01-22 | 2020-10-16 | 江苏恒力化纤股份有限公司 | Method for controlling overfeed rate of winding of filament coil by testing filament tension |
| TWI694190B (en) * | 2019-03-14 | 2020-05-21 | 佰龍機械廠股份有限公司 | Distribution system of pattern file automatically adjusted by circular knitting machine |
| IT201900011448A1 (en) * | 2019-07-11 | 2021-01-11 | Lgl Electronics Spa | METHOD FOR FEEDING A PLURALITY OF YARNS TO A TEXTILE MACHINE BY MEANS OF THEIR POSITIVE YARN FEEDERS |
| CN111470379A (en) * | 2020-04-17 | 2020-07-31 | 李小琴 | Negative yarn feeder for textile machinery |
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| CN100436682C (en) * | 2002-07-30 | 2008-11-26 | 梅明格-Iro股份有限公司 | Method and device for delivering threads |
| CN101376474A (en) * | 2007-08-31 | 2009-03-04 | 爱吉尔电子股份公司 | Method for controlling the tension of the yarn unwinding, and apparatus for carrying out such method |
| CN103596864A (en) * | 2011-06-08 | 2014-02-19 | Btsr国际股份公司 | Method and device for feeding a thread to a textile machine with constant tension and constant velocity or quantity |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005067791A (en) * | 2003-08-22 | 2005-03-17 | Asahi Kasei Fibers Corp | Continuously feeding method for elastic yarns |
| ITMI20100887A1 (en) * | 2010-05-18 | 2011-11-19 | Btsr Int Spa | METHOD AND DEVICE PERFECTED TO POWER A THREAD TO A OPERATING MACHINE WITH TENSION AND CONSTANT SPEED |
| JP6086882B2 (en) * | 2013-10-31 | 2017-03-01 | 株式会社島精機製作所 | Yarn supply system |
-
2016
- 2016-06-03 EP EP16172795.3A patent/EP3103749B1/en active Active
- 2016-06-12 CN CN201610409259.0A patent/CN106245212B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436682C (en) * | 2002-07-30 | 2008-11-26 | 梅明格-Iro股份有限公司 | Method and device for delivering threads |
| CN101376474A (en) * | 2007-08-31 | 2009-03-04 | 爱吉尔电子股份公司 | Method for controlling the tension of the yarn unwinding, and apparatus for carrying out such method |
| CN103596864A (en) * | 2011-06-08 | 2014-02-19 | Btsr国际股份公司 | Method and device for feeding a thread to a textile machine with constant tension and constant velocity or quantity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106245212A (en) | 2016-12-21 |
| EP3103749A1 (en) | 2016-12-14 |
| EP3103749B1 (en) | 2019-12-04 |
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