CN101736503A

CN101736503A - Yarn-feeding apparatus for textile machines, with control of the feeding parameters

Info

Publication number: CN101736503A
Application number: CN200910224569A
Authority: CN
Inventors: Z·彼得罗; P·吉奥瓦尼
Original assignee: LGL Electronics SpA
Current assignee: LGL Electronics SpA
Priority date: 2008-11-13
Filing date: 2009-11-12
Publication date: 2010-06-16
Anticipated expiration: 2029-11-12
Also published as: EP2186932B1; EP2186932A1; CN101736503B

Abstract

Yarn loops are unwound from a yarn feeder (18) provided with a stationary yarn-winding drum (20) upon request from a textile machine (16). Braking means (28, 128) apply a braking action by friction on the unwinding yarn in such a way as to maintain the yarn tension substantially constant. A yarn consumption sensor (34) continuously measures the actual yarn consumption and generates a corresponding signal (PS) indicative of the consumption. Processing means (32, 36) calculate a consumption signal (YC) on the basis of the corresponding signal (PS), compare it with a predetermined consumption range, and adjust the stitches as a function of the difference between the two values.

Description

Can control the Yarn feeder that is used for weaving loom of yarn feeding parameter

Technical field

The present invention relates to control the Yarn feeder of the weaving loom that is used for, particularly knitting machine of main yarn feeding parameter.

Background technology

As known, comprising on the modern textile production line of knitting machine or similar machine, using tension pick-up to measure/control the tension force of the yarn of feeding machine, to keep its substantially constant.Especially, it is desirable to elimination and may cause finished product defective and more low-producing tension fluctuation.

Described such equipment in EP 0 950 742, wherein, by a yarn feeder yarn has been fed machine, this yarn feeder is provided with the rotation of the yarn of reeling thereon around the yarn tube, and yarn is pulled out from the yarn thick stick and it is delivered to machine.By means of a Tension Control loop, thereby control the yarn tension that yarn feeder is fed by the rotating speed that changes rotation yarn tube based on the signal that receives from tension pick-up.Therefore, the variation of the tension force that apply is converted into poor between the spinning velocity of setting on yarn feed speed and the downstream machine.

For compensate as mentioned above and yarn feed speed that Tension Control is modulated relatively and machine on poor between the drawing velocity set, can send the signal of an indication yarn feed speed to the control module of machine, yarn feed speed is based on that velocity of rotation and rotation calculate around the diameter of yarn tube; Control module is regulated stitch according to this speed, poor with between compensation yarn feed speed and the spinning velocity.

The equipment of EP 950 742 is also unsatisfactory aspect precision, this is because the yarn feed speed that calculates as mentioned above not only is used for the Tension Control loop but also be used for the velocity variations compensation circuit, but may since inevitably yarn at slippage and the inertia of yarn and with actual speed differ bigger of rotation on the yarn tube.

In addition, in the equipment of EP 950 742, the direct influence that Tension Control causes on yarn feed speed can cause that the recirculating loop frequency that compensation speed changes is activated on the highland very much, and this and then causes the stitch governor motion quick-wearing very in the downstream machine again.

In addition, compensation Tension Control loop and the velocity variations that applies can influence the fast property that control system responds thus because rotation stand certain delay around the inertia of yarn tube.

Summary of the invention

Therefore, a main purpose of the present invention provides a kind of Yarn feeder that is used for weaving loom, and wherein, comparable known device more accurately and is more apace controlled yarn feeding parameter, particularly yarn speed and yarn tension.

Another object of the present invention provides a kind of equipment, wherein can reduce the wearing and tearing of stitch governor motion in the weaving loom.

The above-mentioned purpose and other advantage of can becoming hereinafter more clearly realize by having according to claim 1 the equipment of feature, although and dependent claims has been stated other less important favourable feature of the present invention.

Description of drawings

Now describe the present invention in more detail with reference to several preferable but non-exclusive embodiment, the mode with non-limitative example shows these preferred embodiments in the accompanying drawings.In the accompanying drawings:

Fig. 1 diagrammatically illustrates the Yarn feeder that is used for weaving loom according to of the present invention;

Fig. 2 diagrammatically illustrates the Yarn feeder that is used for weaving loom according to an alternate embodiments of the present invention.

The specific embodiment

At first with reference to Fig. 1, Yarn feeder shown in the figure 10 is wherein extracted yarn 12 out from yarn thick stick 14, and via the yarn feeder 18 of the static yarn tube of being provided with of known type it is fed traditional weaving loom, and preferably knitting machine 16.

For example described the yarn feeder of the above-mentioned type in applicant's EP 707 102, this yarn feeder comprises a static yarn tube 20, the flywheel 22 that drives by motor 24 on this static yarn tube coiling multiturn yarn coil to form weft yarn storing 26.In case machine 16 requirements, just unwinding yarn coil and it is fed machine from the yarn tube 20.

Yarn feeder 18 also is provided with brake apparatus, this brake apparatus comprises the hollow brake component 28 of frustoconical, this brake component coaxial arrangement and its big substrate are positioned at the place ahead of static yarn tube 20, and this brake component is biased in sending on the edge of yarn tube by actuator devices 30 with its inner surface.The yarn that yarn feeder 18 is sent is pressed against sending between edge and the brake component 28 of yarn tube 20, is subjected to braking action by friction by this.Actuator devices 30 is by 32 controls of yarn feeder control module, this control module receives tension signal TS from the tension pick-up 33 along the paths arrangement of yarn, and brake signal BS being applied to actuator devices 30 based on it, this brake signal BS is modulated into the tension force substantial constant that keeps yarn.

Yarn feeder 18 also is provided with the sensor 34 that is used for measuring continuously the yarn consumption amount, the piezoelectric transducer that this sensor preferably connects described in applicant's EP 1,335 054.Alternately, can use optical pickocff described in EP 0 327 973.In this manual, term " consumption " or " speed " are used for defining the amount of thread of sending away from the yarn tube along with the past of time.The signal that is generally a pulse signal PS that is sent by control module 32 processes sensor 34 to calculate the accurate number and the yarn coil part of the yarn coil that unwinding is got off from the yarn tube, produces point-device consumption signal YC by this.If need to consumption system for measuring quantity more detailed description, can be referring to the description of EP 1 335 054.

YC sends to machine control unit 36 with the consumption figure signal, and this control module is programmed to compares measured consumption with predetermined consumption scope, and regulates the stitch (not shown) according to the difference between these two values.

At work, yarn 12 is fed to machine 16 via yarn feeder 24, and makes its tension force keep substantial constant by the modulated braking action that is applied by brake component 28.If the braking action that is applied by brake component 28 causes yarn 12 speed that its speed is measured by sensor 34 and slows under the consumption scope of setting on the downstream machine 16 that then machine control unit 36 is just regulated stitch, to compensate poor between these two values.

Intelligible immediately as those skilled in the art, equipment 10 according to the present invention does not but directly influence the yarn feeder 18 that is provided with static yarn tube and brake apparatus type of the mode work of yarn feed speed by using to control yarn tension, thereby allows very accurately to control the tension force of yarn 12 and regulate stitch.This loop that makes compensation speed change is not interrupted so continually, and thereby reduces the wearing and tearing of stitch governor motion.

In addition, do not use the shortcoming that yarn feeder brought of band rotation yarn tube according to equipment of the present invention, as mentioned above, use rotation yarn tube, the fast property of system responses can be subjected to the influence around the inertia of yarn tube and the adjustment criteria that adopted.

But, the point-device consumption measuring system of equipment utilization according to the present invention, this has also improved the precision of velocity variations compensation circuit.

Fig. 2 illustrates the second embodiment of the present invention, and wherein corresponding or similar parts are with identical designated.

In the equipment of Fig. 2, yarn 12 is braked by the brake 128 of type described in the EP 1 072 707 in the downstream of yarn consumption quantity sensor 34, in this brake, by coming yarn is braked by the pressing piece and the frictional force between the stationary base of electric motor operated.If need be to the more detailed description of this brake, can be referring to the description of EP 1 072 707.

Here described preferred embodiments more of the present invention, but those skilled in the art can make many modifications certainly within the scope of the claims.For example, although brake apparatus of the foregoing description and tension pick-up are connected to machine control unit via the yarn feeder control module, they also alternately are directly connected to machine control unit and are handled by it.For this reason, the treating apparatus described in the claim can comprise yarn feeder control module 32 and machine control unit 36 both.Certainly, employed brake apparatus can be different type in first or second embodiment, for example, in the situation of first embodiment, can use metal forming brake, brush brake or similar brake, and in the situation of second embodiment, can use the swing arm brake, as known to those skilled in the art.

Claims

1. but Yarn feeder that is used to be provided with the weaving loom (16) of metering needle pin is characterized in that described Yarn feeder comprises:

Be provided with static yarn feeder (18), staticly go up the unwinding yarn coil from described when requiring around yarn tube (20) at weaving loom (16) around yarn tube (20);

Brake apparatus (28,128), described brake apparatus (28,128) is controlled to apply braking action by friction on the yarn under the described unwinding, keeping the tension force substantial constant of described yarn,

The corresponding signal (PS) that yarn consumption quantity sensor (34), described yarn consumption quantity sensor (34) are arranged to measure actual yarn consumption amount continuously and produce the described consumption of indication; And

Treating apparatus (32,36), described treating apparatus is programmed to based on described corresponding signal (PS) calculating consumption signal (YC) and with it and compares with predetermined consumption scope, and described treating apparatus connects into according to the difference between described two values and regulates described stitch.

2. equipment as claimed in claim 1 is characterized in that, controls described brake apparatus (28,128) based on the tension signal (TS) that the tension pick-up (33) along the paths arrangement of described yarn sends.

3. equipment as claimed in claim 1 or 2 is characterized in that, described brake apparatus (28) is arranged in the upstream of described yarn consumption quantity sensor (34), is pressed against on the described yarn tube with the yarn that described unwinding is got off.

4. equipment as claimed in claim 3, it is characterized in that, described brake apparatus comprises the hollow brake component (28) of frustoconical, described brake component coaxial arrangement and its big substrate are positioned at the place ahead of described yarn tube (20), and described brake component is biased in sending on the edge of described yarn tube with its inner surface.

5. equipment as claimed in claim 1 or 2 is characterized in that, described brake apparatus (128) is arranged in the downstream of described yarn consumption quantity sensor (34), with yarn that described unwinding is got off by between the pressing piece and stationary base that are pressed in by electric motor operated.

6. as each described equipment in the claim 1 to 5, it is characterized in that, described yarn consumption sensor (34) is the piezoelectric transducer that produces pulse signal (P), and described treating apparatus (32) is programmed to and handles described pulse signal (PS) to calculate accurate yarn coil number and the yarn coil part that unwinding is got off from the described yarn tube.

7. as each described equipment in the claim 1 to 5, it is characterized in that, described yarn consumption sensor (34) is the optical pickocff that produces pulse signal (P), and described treating apparatus (32) is programmed to and handles described pulse signal (PS) to calculate accurate yarn coil number and the yarn coil part that unwinding is got off from the described yarn tube.

8. as claim 6 or 7 described equipment, it is characterized in that described treating apparatus comprises the control module (32) of yarn feeder special use.