DE1685867A1 - Process for overhead winding of yarns - Google Patents

Description

description

for a patent application from IMPERIAL GHEMIGAL INDUSTRIES LIMITED, Millbank, London,

England
concerning:
"Process for overhead twisting of yarns"

Priority; 1st September 1966, England

The invention "relates to methods that look to UiDerkopfweulen relate from yarn. The jerking of the head of yarn, "for example on the well-known ring spinning machine, is then used when one wishes the yarn through the process of liickelns one To give twisting or twisting.

The well-known all of such a tibesian head twine can be seen in the stretch twist - synthetic pale thread. ₉ olMöhl die

109030/0430

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BATH ORIGINAL

The invention is of course not limited to this.

A draw twister is generally essentially a CAP or ring twister incorporating roller mechanisms for drawing the undrawn yarn. Usually such mechanisms consist of nip rollers that are rotated at a certain speed and serve as delivery rollers; and a combination of stretching claws and separator rollers, the first roller being rotated at desired higher speeds in order to produce the stretching action of the loads in the embossing. Yom Streekylinders run the drawn loads essentially to a thread guide arranged axially or almost axially to the spindle of a ring and rotor ring machine. The thread guide is often also known as a balloon guide »because the yarn is wrapped in a balloon shape underneath it due to the rotation of the traveler around the ring» The load then wex-iea around a spindle arranged on the rotating spindle. Coil according Hihruag in the Mufer wrapped _s the self uaä around the Ring.durch way. Moving around fes Hinges in his rail s shell or some other question * Ju ~ - Axial direction of the spindle rotates "we ä ₉ ... and -swar / each aaofe the" lufbaubewegöBg, which for.Each this "on" iie SarisrC'Ile su wioJselnde. "Gar & spis-Ie is required.

Έχη a well-known Lutist grip consists of » ~ äe & Slag üem -

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1685B67

To tilt the ring spinning mechanism so that the threads are deposited onto the thread spool and the thread spool in spiral windings with a wavy path and not in the form of flat screws. A tilt angle between about 3 and 6 ° is common; but even an angle as little as about 1 ° can be used and will result in a significant "curl" component with respect to the lay-up path of the yarn. Rings are generally not set with a higher degree of accuracy than within ί 1/2 °. *

However, such a tilting of the ring is at least one main factor which determines the formation of such patterning areas at certain radii of the coil structure due to the coincidence of adjacent winding locations. This coincidence of these different pattern showing off marriage - this pattern formation is both considered essential to prevent from a technical point of Garnspulenstabilität and Garnabwicklung like in appearance - can i beispiels-, by an analog computer, for any given process in which a winding and draw-twisting going on is going to be calculated. It is thus possible to program the winding conditions in order to prevent the areas of patterning that normally occur.

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BATH ORIGINAL.

A method of "programming" the winding conditions, what has already been suggested is that the spindle speed alternates between two values, switching back from one to the other, etc., if after the calculation 'the winding steps are achieved in which the pattern formation in the respective spindle speed from which one assumes, occurs.

These conditions leading to the formation of the pattern are related to the "winding _{ratio" t ie f} the ratio of the number of revolutions per minute at the winding point for the package to the number of revolutions per minute of the traveler. The pattern appears strongly or around the whole value of the winding ratio? thus the spindle speed program is designed according to the above method so that the speed is switched to the alternative value when the winding conditions reach a value of the winding ratio for the primary speed at which a pattern occurs; and are then reset to the primary value, when the time comes for a similar pattern to occur at the alternate speed.

Although the method described above is theoretically an answer to the patterning problem in overhead

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Seems to be winding, it has been found in practice it is almost impossible to select the respective alternative spindle speed that a wrapping program is generated that actually sets the patterning conditions for wrapping a Full weight spool of thread, say 4 pounds, is prevented. This is because the occurrence The pattern is not related to the moments during the winding process, when the pattern is different

Set inducing winding ratios, but— ™

that over a period on either side of these times is extended; so are when the pattern areas not less than the distance between the pattern-inducing Winding ratios is what certainly not the Sail with the worst Yer ratios is alone when these appear in the thread spool by changing this speed 7-

preventive measures flor such areas at all

possible. Ä

Are in particular neighboring pattern inducers Winding ratios are not multiples of each other, like this it is likely that the Yersttch, such a To avoid the winding ratio by switching to the alternative speed, just to ' a collision with another such winding ratio leads.

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ORIGINAL

The invention is therefore based on the proposal that the Spindle speed in an overhead winding process is programmed and between at least three atis selected speeds is shifted in such a way that the calculated pattern areas at the Spools of thread in the process of being wound are avoided.

According to the invention, a method for winding yarn by overhead winding on a bobbin is now proposed. which is formed with the aid of a rotating spindle in which the speed of rotation of the spindle is programmed to be between at least three selected speed values is shifted in such a way that the calculated pattern areas can be avoided, which would otherwise occur in the winding thread bobbin.

A shift between speeds can occur take place cyclically or in a repeated sequence or progression; alternatively, however, this can also be done graphically in a predetermined, disordered manner, for example calculated to create the best pattern prevention program.

If, for example, three spindle speeds A »B and G are to be used, the shift can take place cyclically from A to B to 0 to B to A etc.

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can sequentially from A to B to G to A to B to C etc. are repeated. Alternatively, any program of out of order shifts can be specified, for example A to G to B to C to A to B.

The speeds chosen become obvious chosen so that they are as close as possible to the optimum speed for the process and yet compatible insofar as they create the desired disparity in speed and thus ensure ™ that the calculated pattern areas are avoided.

Moving from one speed to the other is vferden achieved in sudden-Weise'zur straight through intersection or move faster of the patterning area, ie, the speed does not deal with gradual variations in the speed that the entire winding cycle or the like a significant leil of this take place.

On the other hand, a high frequency can vary with lower Amplitude in velocity can be set to any of all selected velocities, to "spread the turns ratio", and so any To scatter pattern formation caused by abrupt shifts in the spindle speed:

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BAD ORiGlNAU

lig could be avoided. These "stray" conditions should of course not be chosen so that the winding ratio back into the main pattern areas comes in.

Although the use of three spindle speeds has been mentioned above, it will be understood that any number greater than 2 can be used in accordance with the invention can, although each program always for the optimal Number of speeds is worked out with the actual prevention of a pattern are compatible.

The Flush Speed Shift Program is first calculated for the special procedure j then the program becomes a controller for a facility variable speed entered, which drives the drive shaft of the machine. The program can applied in manifold ways, the motiv-ation this is either done by mechanical operation the parts of the machine * for example the Aufbatuaechänismus or from external programming ~ averages derived, for example from a timer mechanism, Punch cards, tapes, etc. that are attached to the machine.

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While the invention is applicable to the winding of bobbins of thread on any type of spool or tube, of course, any particular selected program will be influenced by the shape of the tube, for example by whether this truncated cone is conical or cylindrical. For example, the measures according to the invention were applied to a process in which a 70 Benier-30 thread yarn of polyhexamethylene adipamide nylon was produced at a draw ratio of 3.36 * ((at a speed of 760 m / min (2500 feet / min)) and was and traveler system of a Rieter ring twisting machine was wound up into a 3 pound double-sided tapered spool of yarn on a 4 * 7 cm diameter (1.85 inch) tube with a long-to-cross Iraversen construction:

Constant peripheral speed of the stretching cylinder at 760 m / min (at 2,500 feet / min),

(or a speed that would be a recovery ι

speed of this value is generated).

Tilting the ring - 3 °
Spindle speeds

A - 8,500 rpm

B - 9 120 rpm. ·

ö - 9 850 U / Hin
Spindle speed ".

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Shift program - (A-O-B-A-C-B-A-G-B-A-B-A-B-G)

After the above program it was possible to make the coil, Wind up so that there is essentially no pattern occurred at some Eadius, whereby in particular the pattern areas according to the winding ratios 1: 2, 2: 5 * 1 £ 3 »2; 7 and 1 ϊ 4 prevented As shown in the accompanying drawing, a graphical record of the ratio of spindle speed / yarn speed over the bobbin diameter shows «

The pattern areas can be seen as shaded lines across the graphic recordj and that Spindle speed / yarn speed ratio is plotted as a line over these areas, avoided all of them, since the coil diameter of 4 »7 cm (1.85 in.) Increases to 12.7 cm (5 in.) During a full winding period.

- patent claims -

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ORSGlNAt INSPECTED

Claims (2)

- ii - ■ 'P a t e η t a η s ρ r ü c h. e: 1. Procedure for winding yarn after the overhead winding! Procedure to a bobbin wound with the aid of a rotating spindle, the speed of rotation the spindle during the first winding period is changed so that Musterungsbereich.e to be avoided in the coil * marked (I. that the speed according to a program, at least that includes three selected speed values, is changed. 2. Procedure according to. Claim 1, characterized in that the program is sent to a controller for a variable speed device that drives the spindle shaft. PATENTAMWXtIE ORi-JNG-H ΗΝεΐ «DiM ..-» «. H.BOHR 'DIPL.-1NG S.STAE6W 109838 / O430 I J * '4. Lee rs e ι te