CN102476763A - Method and device feeding yarns to textile manufacturing machine at invariable tension - Google Patents

Abstract

The invention discloses a method and a device feeding yarns to a textile manufacturing machine at invariable tension, wherein the method is used for feeding the yarns to the yarn processing point of the textile manufacturing machine which is far away from a bobbin or a yarn backing-off equivalent bracket, the yarn tension is controlled when the bobbin is approached, so the parameter is instantly monitored and controlled after the yarn is unwound from the bobbin, the yarn which is fed into the textile manufacturing machine is cooperated with a plurality of yarn guide elements before reaching the processing point on the machine, and the yarn guide elements change the adjustable tension. A second tension control is effective when the textile manufacturing machine is approached, and is used for further controlling the yarn tension which is close to the bobbin, so the tension of the yarn which enters the machine is adjusted to a preset constant value.

Description

Yarn is fed the method and the device of textile machine with constant-tension

Technical field

The present invention relates to a kind of method and device that yarn is fed textile machine with constant-tension.

Background technology

The yarn that is used to produce article by textile machine must preferably be fed machinery with constant-tension or constant speed, so that realize no fault production.For this purpose, being used to obtain at least constant-tension, to feed the device of giving be known: these device utilizations cooperate and are connected to the tension pick-up of the electronic loop that generally includes microprocessor control unit with yarn, so that yarn tension data is provided in real time.Control unit receives the tension force by sensor, and they are compared with programmable predetermined tension value (perhaps given value); According to this comparison, it carries out according to predetermined algorithm (for example common PID or ratio one integration one derivative algorithm), and control unit acts on the controlled member that cooperates with yarn, so that change yarn tension if desired.For example, controlled member can be that said motor is controlled by said control unit by himself motor-driven Yarn Brake or spinner.

As described, these devices are generally used for guaranteeing the quality of process of textile production, by means of

Their ability guarantees that real-time yarn feeds textile machine with constant-tension.

Yet, when yarn on the bobbin of its unwinding and the textile machine between operation point or the zone

Distance be such (for example greater than one meter and up to ten meters) so that yarn before arriving machinery

Must be when departing from member or guide element and cooperating with a plurality of, the device of the above-mentioned type uses and receives

Restriction.These cooperations mean that yarn stands direction and angle and changes and rubbed, and it is right

Yarn can produce negative influence after the bobbin unwinding and near this latter's yarn tension (regulate and keep constant).Therefore, for quality of production result, the yarn that gets into textile machine does not have required tension force, is higher than or is different from addition required tension force but have usually.

Aforementioned content is applied to be used for the situation of the textile machine of diaper production certainly, and wherein the bobbin of used every kind of yarn possibly leave several meters of machineries (perhaps but leave it and produce parts), and

And said yarn cooperates with a plurality of guide elements before arriving machinery.

In these diaper production machineries, also there is such problem, because yarn feeds this

The reason of the mode in the zone, (normally elastomeric material is fine for the yarn in feeding machinery production zone

Dimension) tension force can not be guaranteed constant and even.Aspect this, " rotation is got in these machinery uses

Yarn " the thread feed system of type, just wherein yarn from its bobbin through revolving around its axis

Then from the type of its bobbin unwinding, because its characteristic, this system has guaranteed constant speed

Feed to give rather than feeding of constant-tension given.

In addition, because bobbin rotates around its axis, these system's impassabititys " join end to end "

Method regulate yarn feeding.This has influenced mechanical efficient and output, owing to need periodically

It is suspended to change the ceases to be busy axle, and it lacks continuity of operation.

US6676054 described a kind of be used for through utilization join end to end method " upper end is got

Yarn ' ' method is from bobbin unwinding method of yarn.This realizes with respect to the special location of corresponding guide element from the bobbin of its unwinding through each one thread.Yet; Said patent is not described the problem of any tension change that stands about yarn; This problem is because the distance of inserting between zone or the location point at bobbin and yarn feeding textile machine wherein produces; Do not advise that any yarn control solution is constant to keep the getting into regional yarn tension of machinery production, particularly diaper production machinery yet.

As being used for from the replacement of " yarn is got in rotation " method of relevant bobbin unwinding yarn, " upper end is got yarn " method also is known, and yarn does not need the latter around its axial-movement from its bobbin unwinding by this method.This known mode not only allows to join end to end to feed and gives, and for keeping constant tension force from bobbin unwinding and the yarn that feeds textile machine.

Yet, described in statement situation in front, this being used for spun yarn feeding

The known method of loom tool only at yarn after relevant bobbin unwinding and near making yarn tension obtain monitoring at that time and controlling; Owing to tangible space reason or be used for the relevant technology/physical cause of assembly operation that their are carried out, said device compelled with bobbin closed contact (in " yarn is got in rotation " situation) or near its (" and upper end is got yarn ' ' in the situation) operate.

Therefore do not have a kind of method to guarantee to get in the textile machine and batch constant uniform tension with each one thread in the zone that produces article with it by mechanical element.

Summary of the invention

Therefore one object of the present invention is to provide a kind of method and relevant apparatus, can overcome the aforementioned limitations that is used for yarn is fed the known method of textile machine through it.

Another purpose provides a kind of method and apparatus of aforementioned type; Through said method and apparatus; Yarn can be fed textile machine reliably with constant tension force; Even when the latter and the distance of yarn between the bobbin of its unwinding are big, for example be equal to or greater than several meters, or even tens meters.

Another purpose provides a kind of method and apparatus of aforementioned type, has eliminated any friction problem that between bobbin and textile machine, produces through said method and apparatus.

Further purpose provides a kind of method and corresponding device thereof, and it can use the yarn feeding method and still keeping of joining end to end to get into the even constant-tension of the yarn of textile machine.

Further purpose provides a kind of method and corresponding device thereof, and through said method and apparatus, any yarn operation problem on for example guiding such as thread-carrier, pulley and/or deviation element can obtain confirming and control.

Another purpose provides a kind of method and apparatus of aforementioned type; It allows fast and re-adjustments yarn working tension; The tension force of the used every kind of yarn of textile machine just particularly gets into the some place of machinery at yarn, and in repeating the situation of identical production process; Even after the long duration, make article by can be by the working parameter production that recovers again.

Significantly these are realized through the method and apparatus according to the claim of enclosing with the Geng Duo purpose for the expert of the art.

Description of drawings

The present invention will become clearer according to accompanying drawing, and it provides as non-limiting example and a wherein only scheme drawing that accompanying drawing is apparatus of the present invention.

The specific embodiment

With reference to said accompanying drawing; Device of the present invention is used to control yarn F feeding textile machine T, and for example diaper production is mechanical, just a kind of like this textile machine; Wherein each bobbin is with the tool setting of disembarking of one meter to tens meters distance, the required yarn of the said machine work of unwinding from the said bobbin.

In this embodiment, yarn F is from bobbin 2 unwindings, and said bobbin 2 links to each other with another bobbin 1 with the known mode that joins end to end.This can be handled yarn continuously by textile machine, therefore avoids the shutdown when the empty tube of bobbin.Yarn is got the yarn method by unwinding by usually said upper end.

After leaving bobbin 2; Yarn F passes and preferably is arranged on two bobbins 1 and the conventional thread-carrier 3 of 2 fwds; And make that two axis of said bobbin are consistent with the center of thread-carrier, allow the normal switching and the unwinding of two bobbins during with the empty tube of first bobbin of box lunch.With after thread-carrier 3 cooperates, yarn F cooperates with the device 10 that is used to detect and regulate its tension force.Comprise tension regulating element 4 and conventional tension pick-up 5 among device 10 embodiment illustrated in the accompanying drawings of this known type; Said tension regulating element 4 comprises rotating element 4A, and yarn F is driven in the side through the motor 4B of for example brushless type of itself above that.These assemblies 4 and 5 of device 10 are connected to the preferably control circuit or the unit 6 of microprocessor type; According to the tension data that records by sensor 5 and according to the expectant control algorithm; It is compared each data item that records with predetermined homogeneous data (confirming a given value 1); And if said data there are differences and act on element 4 (acting on described motor 4A especially), like this latter stop or slowing down its to the effect of yarn F so that the tension value that the tension force that is recorded by sensor 5 equals to store.

Element 4, sensor 5 and unit 6 define has the first yarn tension control loop 11 of interfering the time very fast, is about tens nanosecs or microsecond.In case this is sensor 5 detect yarn F tension force do not expect change, first control loop must be interfered immediately, this changes at yarn from bobbin 2 unspooling operations because the yarn tractive on the bobbin or take place naturally because the change gradually of bobbin is empty.

In the textile machine of aforementioned type operation multiply yarn, preferably through using a plurality of guide elements 8 to be directed into this machinery from corresponding bobbin, said guide element 8 is through changing its path of motion and space angle with the yarn mutual action for per share yarn.This interaction has produced friction, and it can more or less change the yarn tension between bobbin and the machinery with sizable mode, and it possibly produce passive influence to the article by machinery production.

In order to overcome this problem; Device of the present invention is proposed; Wherein has the second yarn tension control loop; Comprise second tension pick-up 7, it is provided with away from first sensor 5, and is used for the zone of its processing by the textile machine tractive element (not shown) tractive of routine and is provided with near yarn F wherein especially.

This second sensor 7 also is connected to control loop or unit 6 (act on the rotating element 4 or more suitably act on its motor 4B) and limits the second yarn tension control loop with this.Yet according to this loop, unit 6 is according to the predetermined tension Value Operations of confirming given value (set point) 2.In case startup textile machine, given value 1 must be set as with given value 2-and cause; Yet like what point out hereinafter, the given value of first control loop can change during machine works, and given value 2 remains unchanged.

In this respect, in textile machine operating period, first control loop 11 is controlled in known manner and is regulated from the tension force of the yarn of bobbin 2 unwindings.During yarn feeding textile machine T,

Second sensor will be sent into unit 6 by the tension data of its acquisition, and it compares they and given value 2 according to these data and predetermined operative algorithm.There are differences just in case record between data (expression is greater than the tension force of predetermined tension) and the routine data (given value 2); Unit 6 acts on first control loop 11 to revise this given value 1 through improving given value 1, so that change the interference of element 4 on yarn F in fact.This interference is used for giving suitable tension force to yarn, and its tension force is correct when it arrives second sensor 7 like this.

The interference asynchronism(-nization) that should be noted that second control loop in interference time in first loop and to grow many, be about several milliseconds.This is to become unstable for the system that prevents to be made up of two control loops owing to quick interference time in second loop.In other words, the interference time long enough of second control loop can be detected by this latter according to obtain the tension adjustment that data carry out from second tension pick-up 7 by first loop guaranteeing effectively.

Each controls the interference speed of returning obviously is the execution speed of unit 6 corresponding control algorithms, and is the interference speed of tension regulating element 4 therefore.

Device of the present invention is the self adaptation type; Wherein has the fixing given value 1 that is used for yarn F initial tension regulation; With given value 2; The whole time during it uses for this textile machine does not remain unchanged, and this device can make the tension force of the yarn F that gets into textile machine revise fully automatically, and and the bobbin irrelevant (even after the replacing between bobbin 2 and 1) that is derived from of yarn.

Device of the present invention; Therefore it is according to aforesaid form and operate according to aforesaid mode; Can also obtain in various degree an alarm and a preparatory alarm: if second sensor 7 detects the numerical value that too high yarn tension surpasses given value 2, unit 6 sends known type after the failure control of pre-determined number is attempted preparatory alarm warning (for example visual alarming signal).If the tension force that is recorded by sensor 7 almost reaches previously selected very high numerical value (if surpass this numerical value, experience and strength test are thought, and yarn breakage or article quality problem possibly take place), give the alarm signal and suspend this textile machine of unit 6.This prevents production defective article; The problem that causes to descend described in the yarn tension with solution is interfered in (a preparatory alarm) its permission in first kind of situation thus: usually; This possibly also be that this foul can easily be removed by the machine-man owing to the dust or the foul that gather on the element 8.

Dependence is to the said Tension Control on the yarn that gets into textile machine; The present invention can detect fault or the intersection of different yarns in the thread-carrier; It possibly cause not expecting in the yarn tension to change (raising), and in fact it will rupture in the motion of textile machine at it.

The yarn F tension force that therefore might rely on the present invention will get into mechanical T maintains the steady state value that equates with the desired predetermined value, and does not depend in the distance that is used between first control loop of said yarn tension (near the bobbin of yarn from its unwinding) and the machinery.This has guaranteed the stabilised quality by the article of said machinery production.

The present invention can be used in the method for joining end to end that yarn is fed textile machine and be utilized effectively, and therefore prevents undesirable expensive shutdown (particularly in diaper production machinery) and improves the capacity rating of machinery.

In addition, through in unit 6, being stored in the tension data that records on the yarn that uses in the special producing, this production can repeat easily and apace.The electric current that the unit 6 that is used to control said element 4 can detect the speed of the yarn of feeding textile machine, absorbed by the motor of element 4 and the torque of use; And the minimum and the maximum figure that can be used in these parameters are fixed; In addition, the risk of corresponding mass product can be determined or predict with needing not in acquisition.

An embodiment of the invention have been described; And other can draw according to this specification sheets; Such an embodiment for example, wherein guide element is not arranged between sensor 5 and the sensor 7 (even the distance between these elements is quite big and above one meter).

Claims (2)

1. with constant-tension yarn is fed the method for textile machine; Its yarn treatment point is away from bobbin or the equivalent support of yarn from its unwinding; The tension force of said yarn is near the bobbin Be Controlled; This parameter is characterized in that in yarn monitored immediately and control after the bobbin unwinding like this: second Tension Control is carried out in location point or zone near textile machine, and yarn is handled in this textile machine; Said control is used for regulating near bobbin the tension force of yarn, therefore to obtain predetermined expectation yarn tension in said process points.

2. with constant-tension yarn is fed the device of textile machine; Said yarn is from bobbin or equivalent support element unwinding; First tension test and control apparatus are set to detect the tension force of said yarn near said bobbin; So that after the bobbin unwinding, monitor and control said parameter immediately at yarn; It is characterized in that: the second tension test device is provided, and it is near the textile machine zone of handling yarn therein or location point setting and be connected to said first control apparatus, and said second control apparatus is arranged near the said zone of textile machine or location point and carries out second Tension Control; Said control is used to regulate the yarn tension near bobbin, therefore to obtain to get into the preset expected tension force of mechanical yarn.

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