DE1928479C - Method and device for the continuous measurement of changes in length of textile threads - Google Patents

Description

The I! 'Njüiig concerns a method m> h, v. ei:!, iiiitrurnu! λ ζύ <:> kuntinii'erlicivn knife · um Ι.: · ϋ-appropriate textile threads passing through a measuring field or the like, preferably of continuous yarns.

There are known in the textile industry M ^ G ^ era'to the measurements of the relative LangenuiuJerunyen of Allow feet with constant, adjustable load, to carry out tensile strength tests. Fi ---, de: Garnpiüfmssehine Frenze 1'Hahn 1 duiciiljul; the thread / u for this purpose one driven by one each Entry roller and take-off roller. t'earcnzles Prüftelci, in which the thread by means of an a lever articulated load roller tr.it a certain force is loaded. The Lai-everäriueiungen tier load role corresponding i) fluctuations in awareness are registered (Koch - Sattlow, "Textillexikon", p. 534, BiU 6). Lm here the falsehood developing in the test field to compensate, one can use the advance of the Alvugswalze compared to the Eiiuugsvva!? c by means of of a regulating motor, from which the load role load-bearing lever is controlled. With the rollers and one downstream of the measuring section Measuring units are connected to length measuring units. This will eventually make the length of the checked Thread, the mean in the measuring section caused by the permissible tensile stress To determine the elongation and the length of the thread wound on the measuring line. Because the wind tension compared to the tensile force in the measuring section is small, the elasticity of the thread leads to a Shortening of the thread, and the measurement provides numerical information about the size of the permanent elongation (Stein, »Tensile strength tests on the go

! 928 479

3 4

Thread·. Reprint from the magazine chemical fibers. rich training programs for '.issenscluifi-

HcIr 3. 1966). The in this ver <^; public or practical purposes must be carried out

Tails described Gainprüfmasehine after Diet / can.

works in a similar way. S-) is that of the f. Treatment. z. B. a Temperaturbcaufschlagimg Bekisumüsroii · .. ebi-if necessary on a Gewidiistiekisteten of the thread, in the Meöfeld continuously registered rubbed! angi'l '-' nkt. The Ab ^ ugsgeschwindigkeii of the neither., With the thread from the test field on the record in question can be changed, in that at the same time the relative length changes of the Alviugsvvaizc are conical and the alignment can be recorded. The ·, estelk de- · thread on the take-off «alze means possible, the treatment conditions during: ine ^; of dog hetätigbareu Gewindespimie ¹ \ ER a Messunii to vary and so that the vent · ".. who moved thus w ^ r-ia Can · - to capture ursachten Längenänderunueii the same time.. •• honors ind ^; can adjust. The speed in the Waizvverkindiistrie is; it when rolling uiuer. diied-i between the input roller: nd the Ai- bands known, the train caused by the rollers '* al-. e ¹ serving as MaG P'i the ausceübU' Dehnutm. 15 ligament stretching uni; continuously measure by using the

You ·. * .- known in the! exiiliorschiing and Te-: - Supplier speed and the withdrawal speed

lilinduit.ie applied DeJinurigspriifgenii ,. have miserable speed: and from these two speeds

• evioe! · Eirc gan / .r series μ η Nuchteiici ·. Sn erniüp- the stretching of the ligament -tactig determined. However

!

Treatments caused by harm l.äi; L-il: nd. z-> others al-, they are called investigations into textile thread

nmr.en / <i Φι ssen Auen \ < in these before ¹ .know occur, as they are by the present invention

Devices that imitate the length change univr. urr- allows grazing.

and / eitraubena. and only rivets can be used.

i · Change in length:. · ¹¹ or Dehnuniissc'iv an- ren, since one of the two speeds t. or

i'rmuifl · v-erden. ^ 5 r ... preferably the input speed i · ,.

Dt! '' Pnuiing lagt dt * sna! B the task / utrunde. is kept constant at all times. In this case it is

a \ .ri.'hie; · of the oii ^ dnius called .art too sharp'- -s sufficient if only the variable speed-

iei; ! π.11_I-- ν.eichem which is measured by a thermal coefficient.

action or a similar treatment caused ·! In a preferred development of the invention

I.a'pc -. 'Niindfiiingen of threads continuously, quickly 30 according to the method according to the invention, the thread runs through

1: · '' errnitieh -icher vn running yarn and iiairii: einanderfoigend two measuring fields, in both

aiiiz.veiai or can be registered, whereby this.

Meisiinge- aucii can be determined under continuously changing genetic changes. Here can

Treatment conditions of the thread carried out; expediently be provided that the thread in the

wtrd.v can, provided that the ·; is desired. si that 35 of him first traversed measuring field one one

urn ■ -.iijt "-vch'_ (jntersuchungsproGramnv for knowledge- change in length of the thread causing treatment-

> ch;: ltlivii. · or practical purposes, for the beknic! the treatment is subjected and in the second NLIUeId

Ermitil'vi »the most favorable temperatures for the relaxation (slackening) of the \ oran-

a length change caused by continuous yarns in stretching or shrinking foci treatment

felflorn. ras: h and safely carried out and 4c gene is measured,

körriic ". To carry out the novel procedure is

E ^r findinL ".» Emä "i this task is provided in accordance with the provision of a facility which

lo; t. daCi eic ·; Fell passes through a first measuring field, is characterized by feed means for con-

^; i v .--! C-Ii-. ¹ '''eic"threadeiii'-r a length jii'dernng linuierüche passing the thread through at least

offensive treatment, 7 .. B. Temperatti'beauf- \ - at least a measuring field, clamping means for generating the

schiamiiit ;. Unierzug is, and that the thread length constant thread tension in the measuring field, a

in the measuring field with constant thread span now ?, con control device for keeping constant the in the

sT.:nt is held, as well as the thread length located in a calculating scarf measuring field, as well as measuring and

! uiiL. od. dg ¹ from the input speed calculation means to determine the relative length

speed '·, of the thread in the measuring field and the output change Ii // - (i \, V ₁ ) / V _{1 of} the thread in which b' ¹ -

cc-schwinclijjkeil of the thread from the measuring field from the measuring field, where r, the input speed

ieit -. 'With electrical signals continuously the relative thickness'', of the thread and r., its starting speed

Lünuenwechsel of the thread in the measuring field is after digkeit from the relevant measuring field.

the equation IrI- (Io-V ₁ ) Zv, calculating! The advancing means can be of any suitable type, where i is the length of the known type in the measuring field. For example, can

dens and (1 be the long driven conveyor rollers or godets entering the measuring field,

change of thread is. The tensioning devices to keep the thread tension constant

The voltage corresponding to the relative change in length can, for example, be a weighted or fixed

The output of the computing device can then display the loaded tensioning pulley, or it can be a and or be registered. 60 take-off rollers are provided, which the Faucn with

This method enables a constant voltage from the relevant measuring field in a simple manner

L'entersuchun- peel off quickly and safely on the running thread.

genes to carry out how a certain hand- The invention is based on a

treatment, preferably a thermal treatment based on preferred exemplary embodiments, even further Length changes of the thread, these 65 details and characteristics explained.

Measurements even under continuously changing Tn of the drawing is a schematic of an invention

"" Treatment conditions of the thread carried out according to the device for determining relative

can be so that extensive length changes of a filament 12 in two beginning

shown in the following measuring fields IO and II, the the thread traverses continuously, whereby the thread is subjected to a thermal treatment in the first measuring field IO, the effect of which on the Length of the thread is to be determined.

The thread 12 to be treated and measured is fed by means of a driven pair of rollers 13 at a constant speed in the first measuring field 10 and by means of a speed controllable from a Motor 31 driven godet 14 with an associated lay-up roller 15 from the first measuring field withdrawn and drawn into the second measuring field 11. From the second measuring field it is removed by means of a take-off roller 17, which it partially loops around, diverted and via a pulley 18 into a storage container 19 filed. The take-off roller 17 is by means of a drive motor 17 ', for. B. by means of an electric motor, a falling weight or the like. Driven with constant torque, so that the Thread tension of the take-off roller in the second measuring field 17 incoming thread is constant.

In the first measuring field, the thread runs through a treatment room 20 in which it has a thermal Exposure to hot air, contact heat «; or is exposed to thermal radiation. In the present example, the thermal treatment is carried out Heating by means of hot air. Alternatively, in the case of synthetic threads, a hydrothermal or water treatment possible for non-synthetic threads. Synthetic material threads are thereby shrunk. In the first field a constant thread tension * is achieved by a enordered in the manner shown, weighted weight Maintain tension pulley 23. The vertical position of the tension pulley is determined by means of an inductive Measuring head 24 constantly sensed. This measuring head 24, which represents an inductive sensor, has a Core 25 made of magnetizable material, which is in an induction coil to which an alternating voltage is applied 26 protrudes differently depending on the position of the tensioning pulley. Measuring heads of this type are known per se. The actual value of the inductance is pressed to a controller 29, which is usually Way an electrical bridge or. The like. In which the actual value is compared with a target value , whereby in the event of system deviations (difference between Tst and target value) on Output of the controller 29 a control signal occurs, which an adjusting device 30 for adjustment de. Speed of the drive motor 31 of the godet 14 is fed. This scheme is such that the output speed of the thread 12 determined by the speed of the drive motor 31 the first measuring field is always set so that the vertical position of the tension roller and thus the length of the thread of the thread located in the measuring field 10 is kept approximately constant. Form with it the measuring head 24, the controller 29 and the adjusting device 30 a control device for keeping constant the Fatlon length in the first measuring field. At the same time will the thread tension in the first measuring field is also kept constant, since it is controlled by the tensioning roller 23 caused weight load is determined.

The entry speed into the first measuring field 10 is determined by means of a non-driven deflection roller 35 sensed, over which the thread 12 runs and thereby drives it slip-free. This IJmlenkrollc 35 in turn drives a tachometer generator 36.

its output signal proportional to its speed and thus proportional to the input speed of thread 12 is. The initial speed of the Fiidens 12 from this first measuring field 10 is by means of Another roll 40 felt, I also felt is driven slip-free by the thread 12 and in turn drives a second tachometer generator 41, whose output signal is consequently proportional to the output speed.

ίο The input speed in the second measuring field corresponds to the initial speed from the crsti'ii measuring field, so that the Taehogcnerai (.r41 the measurement of the output gcsohuindigkcii des Thread from the first measuring field 10 and the same high input speed of the thread into the second measuring field 11 is used. The exit speed from the second Mcßfeld 11 is driven by one of the take-off roller 17 rotationally locking angel NEN tachometer generator 42 measured.

The output signals of the two tachometer generators 36 and 41 are fed to a back sound system 43 through the lines 36 ', 41'', which from these two signals, which _{correspond to' ·, and r 2} , the relative change in length 11/1 - (v _ä v, ), 1 ·, of the fa-

»5 dens in the first measurement field 10 calculated. That of these relative Signal corresponding to the change in length is fed to a display device 44 which shows the relative Changes in length continuously.

The display device 44 can of course also be connected to a recorder, if so desired, or in place of the display device A non-recording device can be provided on its own being.

The determination of the in the second Mcßfeld Il occurring relative change in length serving output signals of the two Taehogencratorcn 41, 42 are fed to a second computing circuit 43 ', which in principle can be designed the same as the Computing circuit 43. This computing circuit 43 'is provided with a display device 44' for displaying the in the second Measuring field 11 occurring relative change in length connected. Here too, of course a registration device can be provided in addition or on its own.

The first measuring field 10 extends from the first deflection roller 35 to the second deflection roller 40 and that second measuring field from the second deflection roller 40 to the take-off roller 17.

As shown, the thread length in the first measuring field is determined by regulating the position of the thread tension causing tension roller 23 kept constant. In the second measuring field, however, the The thread length is kept constant by the fact that all guide means - here the deflection roller 40, the godet 14 with laying roller 15 and the take-off roller 17 - stationary are arranged so that the Fadcnlänge between the deflection roller 40 and the take-off roller 17 is always is the same size. This formation of the two measuring fields 10, 11 is particularly favorable.

It is preferably provided that a shrinkage of the thread is brought about in the first measuring field and measured and in the second measuring field the subsequent relaxation of the previous shrinkage is determined.

To determine the relaxation, a very low value is expediently used in the second measuring field 11 Thread tension worked, which can be considerably smaller than the thread tension in the first measuring field 10.

1 sheet of drawings

Claims (9)

Put-iitaiispi iiclie: 1. Methods of continuously measuring changes in length of textile threads passing through a measuring field. Like., preferably on continuous yarns, characterized in that the thread (12) passes through a first measuring field (10) in which the thread is subjected to a treatment causing a change in length, ic z. B.T TemperaturbeaufscIilagung, is subjected, and that the thread length in the measuring field is kept constant at constant thread tension, and that in a computing circuit (43) cd. From the electrical signals derived from the input _{speed (T 1} ) of the thread (12) into the measuring field and the output * - gesehvindigkeit of the thread from your measuring field continuously dit the relative change in length of the thread in the measuring field according to the equation .J1 / 1 - (ι., 1,), V ₁ is determined, where 1 is the length of the thread located in the measuring field and 11 is the change in length of the thread occurring in the measuring field. 2. The method according to claim 1, characterized in that the length of the thread (12) in the first measuring device (10) by controlled adjustment of the input or output speed r, or ι ·., is kept constant. 3. The method according to claim 1 or 2. ciadurcii characterized in that the input speed wedge (ι,) de.- in the first measuring field Π0) incoming Thread (12) is kept constant 4 Method according to one of the preceding claims, characterized in that the thread (12) runs through two signal fields (10) or (11) one after the other and in both MIR fields the relative length occurring in them is narrowed ( ll / t) of the thread can be found. 5. The method according to claim 4, characterized in that that the thread (12) in the measuring field (10) which first passes through it, causing a change in length of the thread Treatment is subjected and in the second measuring field (11) the relaxation dei the previous treatment caused a change in length measured wiid. 6. Device for performing the method according to one of the preceding claims, characterized by feed means (13, 14.17) for the continuous passage of the thread (12) through at least one measuring field (10 or II), clamping means (23, 17) for generating the constant Thread tension in the measuring field, a control device (24, 29. 30; 40, 14, 15, 17) / to keep constant the length of the thread located in the measuring field, as well as measuring and computing means (36, 41, 42, 43, 43 ') to determine the relative change in length (. I ///) of the thread in the relevant Measuring field. 7. Finrichiung according to claim 6, characterized in that at least one position-adjustable tensioning roller (23) is provided for generating the thread tension in a measuring field, and that the position of the tensioning roller (23) to maintain the thread length by means of the regulating device (24, 29, 30) ) can be regulated, which influences the input speed (v ₁ ) or output speed (V 1) of the thread (12) passing through the relevant measuring field (10 or 11). S. device according to claim (1 ocier 7, dudurch characterized in that the measurement initiation to; Solution of the input and output values of the relevant * measuring field ft <f or 11) passing thread (12) at least one tachometer generator (36, 41, 42) or ühnILI.e Meßvveriaaufnehmer exhibit. 9. Device according to one of claims ti to fi, characterized in that, in the presence of two measuring fields (10, 11) through which the thread passes successively, Uie input speed of the second measuring field * ί; \) corresponds to the initial speed of the first measurement (JO) ! (). Device according to claim T unc ¹ 9, characterized in that the thread length in the first MeEMd (IO) can be regulated by means of the control device and the thread length in the riding MiK-fcid (llj is kept constant as a result. Jj (! The thread (12) in the second MeUIeId (Ii) iediglich via stationarily arranged Fadenleitmitie! (40 14, 15, 17) is passed, and Dau the thread tension in the second measuring area before / ugsv.eis. ¹ driven by a with.-iners constant torque Ahzugswal / e (1 /) kept constant we ·.!.