DE1435597A1 - Method and device for false twisting of running yarn - Google Patents

Description

N.V. Oi ^ DERZO ^ KINGS B * STITUUT RESEARCH, Veiperweg 76, Arniiem,

Netherlands

Method and device for false twisting of running yarn

Priority: September 12, 1 y6i / j>! Netherlands (Registration iir. 269.191)

The "ürligung concerns a method and an apparatus for False splicing of running yarn, which by one preferably A rotating movement is imparted to the organ rotating rapidly around a vertical axis by sliding the yarn over the rotating organ can be re-fertilized. For this purpose is the rotating organ provided with wrap-around fl'ichön.

Process of this type and the devices used are known per se and they are often used for crimping filament

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yarn used. Such a yarn becomes one for this circle Subjected to fixing treatment while it is twisted up State. After the yarn the false twisting device it is untwisted again, but it retains it as a result of the previous fixing treatment the tendency to curl sicri, bex.

In order to be able to keep this twisting process economically on the clock, the device used must be extremely simple and inexpensive and require little power and maintenance. In addition, the device must be able to withstand high speeds and be easy to use.

In the case of the known methods and devices, there was an obstacle which a continuous simplification and acceleration of the manufacturing process and a reduction of costs This set a limit in the difficulty of supporting the rapidly rotating organ. This organ must be in radial and axial bearings be supported, the axial bearing in particular always causing the greatest difficulties.

In known devices, ball bearings, Roller bearings or gas bearings are used. ils were already Solutions proposed in which the false twisting spindle with Was provided with grooves, in which the edge of support wheels a & riif, which the spindle «both in the radial and in the axial direction propped up.

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However, all of these solutions are either costly or they are do not allow high speeds, or if high speeds are possible at all, the devices are subject to very rapid wear and tear.

The invention relates to a method and a device in which the above-mentioned inconveniences are avoided and as a result Combine both a cheap structural solution with little wear and tear, as well as enabling a high product speed.

The inventive method consists essentially in that the rotating organ at least on that side against which it tries to move under the combined influence of its weight and the yarn tension, thereby in the axial direction is supported that the course of the yarn between a fixed, coaxially arranged thread guide eye and the sciinell rotating organ at an angle to the axis of rotation in a direction whose radial component has the same size Has order like the axial component.

It was found that the rotating organ during operation assumes a stable position in the axial direction when the yarn runs in such a direction and when it is around the rotating member üerunujesciilungen will. Around the rapidly rotating axis in the Maintaining an axial balance are not the norm for the long term usual: -öi '. La.vii "required. JJs is ^ aiiz überras juuiid, dab on

this way the running yarn itself causes the tracking.

To explain this effect, the play of forces between the rash

eri / rotating organ and the one wrapped around it / u-arn closer.

to be viewed as.

It has been shown that the resultant of the process according to the invention from the yarn to the rotating member The forces exerted at any given moment can be imagined as being broken down into two components. One of these components, which in axial Direction is always in equilibrium with all other forces, which in the axial direction on the rotating organ act, such as B. its own weight, etc. The force component directed against the axis has a constant magnitude, but its direction changes in space at the same speed, with which the rotating organ turns. As a result of the great speed with which this force component its Changes direction, it is practically unable to disturb the radial equilibrium of the rapidly rotating organ. A surprising, further gate part of the Yerfanren according to the invention is that the floating bearing of the rapidly rotating organ also seems to have a stabilizing effect on the yarn tension.

If there are any fluctuations in the tension of the running yarn occur * these are caused by small displacements of the rotating

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the organ balanced. 'These small shifts are namely accompanied by "changes in the total angle of wrap of the yarn, which also change the tension in the yarn.

The aforementioned method can advantageously be carried out with the aid of a false twisting device are carried out according to the invention.

This false twisting device is essentially characterized by that the rotating organ in its working position has freedom of movement in the longitudinal direction, that in the vicinity one end of a stationary thread guide eyelet is arranged coaxially and that the run-up and run-off point is one in the vicinity the looping surface located in the thread guide eyelet is essential is further away from the axis of rotation than the inner surface of the thread guide *) se.

By such an arrangement of the wraparound surface with respect to the thread guide eye is achieved that the yarn is along the desired inclined to transversely directed track moved to the thread guide eyelet.

It is of course also possible *, a looped surface and a to arrange stationary thread guide eyelet near both ends of the rotating member. However, it has been found that many do so

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Execution forms is not necessary, especially if the Device in a manner known per se with a radial bearing Is provided.

The position can, however, be different if the rotating organ also has freedom of movement during operation, transversely to the axial direction owns. In this case it generally will not be possible a. mechanical drive system of the usual type to be used. .

In one embodiment of this construction, the rotating member is according to the invention from the short-circuit armature of an electric motor formed..This anchor can be operated without it being connected to any Drive member in mechanical connection stent. In this case, both the radial and axial bearings are used the one around Yarn causes.,,. . -.-

It has been found that a displacement of the armature transversely to the axis of rotation and out of the equilibrium position causes a change in the yarn path, which has the consequence that ·. the anchor is moved back to its equilibrium position. is ...

It has also been discovered that this embodiment of the false twisting device regarding the correct / balancing of the r-otie-

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producing organ is far less sensitive than any other false twisting device is the case. This is due to the fact that the rotating organ is always tends to rotate about a main axis of inertia, practically no matter what its shape.

A particularly simple embodiment of an articulation anchor is obtained according to the invention when it is given the shape of a ring. The thread path between the two thread guide eyelets can be chosen so that the yarn is looped around the ring one or more times at one point.

The false twisting device according to the invention can, however, advantageously also be designed so that the rotating member is supported in the radial direction with the aid of known means is. In this case, a fixed thread guide eyelet only needs to be present in the vicinity of one end of the rotating member which may also simplify threading the yarn.

This embodiment of the device with a conventional radial bearing provided, can also be arranged more easily so that the axis of rotation is not in a vertical position. If z. B. the Axis of rotation is horizontal, becomes the dead weight of the rotating Organs completely taken up by the radial bearing and no radial displacement can occur.

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These embodiments of the device can also, to the most known types of false twisting devices attached without the need to make extensive changes.

He has a possible embodiment according to the invention the drive system has at least one blowpipe and the rotating member is provided with wings. The device comes with Compressed air or operated with any other compressed gas. Such a design can also be used very well in connection with radial grass bearings be used. In a much simpler construction, the rotating member has a tubular part, its Axis coincides with the axis of rotation and in a radial direction is held by freely rotating support disks.

In this case, the rotating organ can advantageously take place are mechanically driven by compressed air when, according to the invention, for. B. two pairs of support disks are provided are, each pair of which forms a wedge-shaped gap in which the tubular part is held by a drive belt which contacts it.

The tubular part can be at one of its ends in various ways Be provided with the above-mentioned wraparound surfaces,

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For example, one or more radially at this end directed support arms be attached, which at their ends Padenf (wear theirs. In this! 'All the yarn runs through first the tube, then along a support arm to a thread guide and finally through the fixed thread threading eyelet. One Design, which is particularly suitable for precise mass production, is characterized in that at least the outer surface of the tubular part is widened towards one end and that before the point of the largest widening the pipe wall with several symmetrically arranged passages is provided.

The yarn can be threaded at the other end of the tube, then passed through the passages one or more times and finally looped around the edge of the flared end and led to the fixed shop guide eye.

In the drawing, the subject matter of the invention is based on two Embodiments of the device according to the invention are shown schematically in the table. Pig. 1 shows a palschzwindelspindel, which © o.uron supports the yarn in the axial and radial direction is »Pig. Figure 2 is a side view of another false twisting spindle which is threaded through the yarn only in the axial direction is supported. Fig. 3 is a top plan view of the "device according to Fig. 2 and fig. 4 1st © in diagram of tensile forces that

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occur in the yarn around the lower end of the spindle according to Fig, 2 is looped.

In fig «1 the running yarn is marked with * fi} *. The false twist spindle is actuated by several magnetic coils arranged in a circle, which are shown schematically and denoted by {2 ·) -. They are fed and arranged in such a way that a rapidly rotating electromagnetic field is maintained within the circle. Inside the magnetic coil circuit there is a metal ring ~ (3-K on which a torque is exerted, which is caused by the eddy currents induced in the ring by the rotating magnetic field. On the lower side of the bing (3) there are two radially opposite points directed grooves (4) provided.

Coaxial with the circle of coils (2) is the same on each side a thread guide eye (5 / fozw, 6) arranged, the latter forms the bottom of a can, the side walls of which from the magnet coils (2) are formed. In this box, the ring (3) can lie at rest.

The yarn (!) Is pulled through the thread guide eyelet (5), at least once around the ring and into one of the grooves (4) looped and finally pulled off through the thread guide eyelet (6),

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When the yarn through the feed and take-off mechanism (not shown) is set in motion and when the coils (2) are energized, the ring (3) is in a rapid ^ Rotational movement offset and held in a position above the plate-shaped thread guide eye (6).

The effect of the grooves (4) is twofold. First and foremost, ensure that the yarn (1) is moved along by the ring and does not roll over the surface of the ring, whereby would result in less twist. In addition, the grooves (4) prevent the thread from being damaged as long as the ring (3) touches the plate (6) when starting up.

The tensile forces in the twine hold the ring (3) both horizontally as well as in equilibrium in the vertical direction. It has been shown that this type of support in equilibrium also then maintained when the false twisting device is brought into a somewhat inclined position.

»In the embodiment according to FIGS. 2 and 3, the tubular False-twist spindle, of which a substantial (Peil der The outer surface is cylindrical, denoted by (7). At its enlarged lower end (8) there are four passages (9) in the same way Spaced apart. In the vicinity of the lower end of the spindle (7) and coaxial to this is a fixed thread guide eyelet (10)

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intended. The yarn (1) is first through the tubular Part of the spindle (7), then threaded through one of the passages (9) and finally through the thread guide eyelet (10).

The Zuftihrungs- and Abzug syst em, which the yarn through the The spindle moved through it is designed in the same way as in the device according to FIG. 1.

Instead of once through the passage (9), the yarn can also be threaded through several passages before it reaches the thread guide eyelet (10) arrives.

The false twist spindle (7) can rotate by means of a belt (11) who is in contact with her. The belt only touches the spindle over a very small angle, so that it is pressed against its radial bearing. This exists from support disc-a, which are coupled in pairs in this way; that each pair represents a freely rotatable system.

The support disks (12 and 13) are connected to one another by a bushing (14) coaxially connected, which is held by an arm (15) so that it can rotate easily.

In the same way, the support pad (16) is coaxial with a

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(not shown) S to ζ disc (17) through a (not shown) Bush (18) connected, which ^ the latter stored in the same way is like the bushing (14) · The two support sleeve systems together form wedge-shaped gaps in which the spindle (7) lies and against which it is pressed by the belt (11).

In Pig. 2 is the point at which the yarn first comes into contact with the spindle, with A, the point where it is vertical Direction runs before it leaves the spindle with B and the point at which it leaves the spindle surface with ö denotes.

Since the support washers and the belt (11) on the spindle only can exert such forces which are transverse to the axis of rotation are directed, the tensile forces in the yarn at the points of first and last contact with the spindle are the only external ones Forces that can balance the weight of the spindle ». . .

Both. known yalschzwirnvorrichtungen the yarn runs table parallel to or in the axis of rotation of the spindle, Ä. in the direction in which the yarn runs at point B.

4 shows the schematic diagram in the yarn (1) at points A and G tensile forces acting. The tensile force at A is indicated by

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P and that at B by Pg. The Balin of the spindle 'at point C leaving the yarn ends with the spindle axis an angle * <£>. It is therefore clear that the train '

foC - apannmig at point C has a size of Pp.e, where f is the coefficient of friction of the yarn with the spindle and e is the base of the natural logarithm.

foC

The force P ₂ -e can be converted into an axial component

and think of a component directed against the central axis' decomposed, which components have a size of Pp.e .cos. cL

• p Οι /

and from pp. own sin.oC »

If the weight of the spindle is G, then the following applies Equation for their soldering critical equilibrium weighted:

P ₂ .e ^foC . cositC - P ₁ +0 = ■ 0

If the yarn runs practically parallel to or in the spindle axis, as is the case with the known false twisting devices, the angle CL, becomes equal to 0 and the formula given above is consequently converted into:

P ₂ -P ^ + G = O V. Ar n ^ iG '^^ L

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Since Pp is always greater than P ₁ , it is clear that none of the known devices can do without an axial bearing of the spindle, since the last equation cannot be satisfied. In this connection it should be added that in the known false twisting devices the yarn can also run upwards, in which pail the yarn tensions can be adjusted so that the equation P ₂ -P ₁ + G = O is satisfied. However, it has been shown that in this Pail it is not possible to do without additional axial bearings because the process in question is not very stable.

Since the puncture e. cos o £ decreases continuously when ^ increases from 0 to 180 °, and becomes 0 when oL = 90 °, in the pale twisting device according to the invention there is practically always a situation in which the spindle is in axial equilibrium and therefore the first-mentioned mathematical one Formula is satisfied.

The one related to the Pig. 2 and 5 described direction can also be operated advantageously in a position in which the Eotationsaxe of the spindle is horizontal. In in this case the following relation applies to the axial equilibrium!

f ch ι
.e. cos oC = P

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When the yarn is in the manner illustrated in FIG the device is running, this condition is always met, regardless of the values of Pp and P-. From the mathematical formulas that relate to the balance of forces, It also follows that if there is an axial sliding weight of the spindle, it is also stable. ”From this it is also stable it follows that the spindle automatically assumes its correct position at the beginning of the process.

It should be noted that in addition to the above-mentioned axial forces, a torque and a transverse force of the order of

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Pg.e. sin 06 act on the spindle, which however at

change their direction twice every turn. As a result of the high spindle speeds of 200,000 revolutions per minute this moment and this transverse force do not disturb the equilibrium position of the spindle.

Although the principle of a false twisting device supported by the yarn was only explained on the basis of the two examples described above, this can of course be done with the most diverse Types of false twisting devices are employed. All of these embodiments fall within the scope of FIG Invention.

The fixing treatment of the yarn is when this is to be curled by a false twister in which

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Softening and subsequent hardening of the yarn in a manner known per se, while this is in the twisted state is located. If a yarn made from thermoplastic raw material is subjected to the treatment, the 3-ixation process in consist of heating and subsequent cooling of the yarn.

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Claims (9)

PATENT CLAIMS 1 J Procedure for false twisting of running yarn, which through an organ that rotates rapidly around a vertical axis a rotary movement is imparted by letting the yarn slip around the rotating member, characterized in that, that the rotating organ is at least on that side against which it is under the combined influence of its body. tends to move weight and the yarn tension, is supported in the axial direction by the fact that the path of the yarn between a stationary, coaxially arranged pad guide eyelet and the rapidly rotating organ at an angle to the axis of rotation runs in a direction whose radial component is of the same order of magnitude as the axial component. 2. I'wo-twisting device with a rotating organ that a or has several wraparound surfaces and a drive system, characterized in that the rotating 'organ in its working position a freedom of movement in the longitudinal direction has that near its one end a fixed thread guide eye is arranged coaxially and that the run-up and run-off point is located in the vicinity of the thread enfiüie rose f-. - _v "^ 809901/0600 - -19 - Wrap area much further from the axis of rotation removed than the inner surface of the thread guide eyelet. 3. Apparatus according to claim 2, characterized in that the rotating organ in its working position also has freedom of movement has transverse to its longitudinal direction and is formed by the short-circuit armature of an electric motor. 4. Apparatus according to claim 3, characterized in that the rotating organ has the shape of a ring. 5. Apparatus according to claim 2, characterized in that the rotating member in the radial direction by known means is supported. 6. Apparatus according to claim 5, characterized in that the drive system has at least one blowpipe and that the rotating organ with wings, grooves or the like. Equipped is.
ι 7. Apparatus according to claim 5, characterized in that the rotating member has a tubular (part of which Axis coincides with the axis of rotation and which is supported in the radial direction by freely rotating discs. 8. Apparatus according to claim 7, characterized in that two pairs of support disks are provided, each of which Couple forms a wedge-shaped gap in which the tubular Part is held by a drive belt that carries this part. 9. Apparatus according to claim 7 or 8, characterized in that at least the outer surface of the tubular part against one end is widened and that before the point of greatest "widening the pipe wall with several symmetrically arranged Passages is provided. 80 9 9 01/0600