DE2211209A1 - Yarn feeder - Google Patents

Description

PATENT LAWYERS

DR.-ING. RICHARD GLAWE DIPL-ING. KLAUS DELFS · DIPL-PHYS. DR. WALTER MOLL

MUNICH HAMBURG MÖNCHEN

8 MDNCHEN 26 2 HAMBURG

PO Box 37 WAITZSTR.

LIEBHERRSTR. 20 · TEL (0411) 89 22 TEL (0811) 22 65 48

YOUR SIGN YOUR MESSAGE FROM OUR SIGN MUNICH

A 9o

REGARDS:

L.I.E. ö.p.A. laLoratorio Italiano Ricsrche

Via Berghini 9 j G-enua / Iballen

Gas supply device

The problem of the inevitable thread feed on textile machines and in particular on knitting machines - like S trump circular stretching machines - becomes important when structural games (e.g. example crimped yarn) or the like. should be used. The same problem then occurs in all yarn processing phases on, as when winding on bobbins or Reels, or when feeding to textile machines or

, i.e. with each type / un Beax'beiUing or

209838/0900

Conversion. In specific cases, in the area of optimal thread tension for the processing machines constructed for this purpose, these yarns show large and, in particular, irregular changes in length and thus changes in the weight of the line even with minimal changes in tension. On the other hand, the uniformity of the finished product, a knitted fabric or the like is important. or a coil, a ball or similar work processes, the more constant the weight per unit area (mass / area) or the density (mass / volume) of each section or each “pool element” or “volume element ^{11 of} the goods lsi the yarn that is processed has a constant stretch weight (linear density or titer) in addition to a constant tension In addition, if different yarns are used in parallel, all yarn feeds must have the same properties.

A constant basis weight is the first condition that is required in order to ensure the constant homogeneity of the To ensure goods. The constantness of the tension is necessary in order to avoid that tensions become in of the finished goods and thus the yarns that are processed with lower tension, relax while reducing the weight of the corner and vice versa. It will be seen that in general the

209838/0900

Spamiing constancy and the equality of the Route weight are strictly linked.

In many cases this has been attempted by the use of positive feeders which Feed the yarn at the speed required for the machine, synchronously mechanically or electrically is adapted to the speed of the machine. These types of feeders, although im Are not able to maintain the required speed in the longitudinal direction of the yarn they are conveying, not precisely - not even partially - offsetting the changes in the nature of the yarn they are adopting.

The object of the present invention is to provide a positive feeding device which is used for feeding of a yarn having a constant draw weight and constant tension, and which is also capable of feeding the Yarn at all possible speeds, as required for the machine from standstill to maximum speed are required, is suitable for practically inertia-free conversion.

The feed device according to the invention essentially comprises a rotating element, which is in the Föixler direction

209838/0900

rotates and around which the yarn to be conveyed runs with a partial loop. This rotary member is provided with means for generating air streams, which have at least a centrifugal component and that it is tensioned and disengages from the rotary member according to one Umsehlingungsbogen, the vort as a function of the voltage acting on the yarn so the Dreheleraent and the yarn texture changes, so that a tension and a line weight are obtained behind it, which are constant at each feed speed of the tension and within certain limits - also of the line weight j- that prevail in front of the rotary element, are independent.

The rotating element rotates continuously and at a constant speed under the only condition that its peripheral speed is greater than the maximum yarn feed speed. If there is no thread feed the yarn remains lifted off the rotating element by the effect of the thrust of the centrifugal air.

According to one possible embodiment, the rotary element is designed as a grooved disk, in the groove bottom of which holes or slots are provided, from which air exits. According to another embodiment, the rotary element is designed as a fan wheel, the wind blades of which have indentations on their circumferential edge in order to open the yarn '

take and lead. This fan blows the air in

- 4 -209838/0900

centrifugal direction. According to other embodiments the rotary element is designed as a roller-shaped cage or as a cylinder, which is provided with suitable air slots is.

The yarn is guided around the rotary element in a plane perpendicular to the axis of rotation of the rotary element, or also with a course that does not lie in such a plane, but e.g. from individual ones against one in this one axis-perpendicular plane lying path inclined sections consists.

The feed device according to the invention essentially offers the following advantages: Firstly, it allows the yarn to be fed from standstill to the maximum, for the Textile machine required speed without having to change the speed of its rotating elements. Second, it is controllable according to the needs of the machine. Third, she also works at large ones Fluctuations in tension and the line weight of the yarn in front of the yarn feed holds, with tension and Line weight of the thread delivered by it can be kept constant.

Special effects can be achieved with the yarn feed device according to the invention. When the Streoken

209838/0900

weight of the section of yarn coming from the outlet of the yarn feeder runs to the textile machine, if it increases, the feed speed related to the thread length decreases with a response time on the order of thousandths of a second and vice versa. In the section running from the feeding device to the processing point, the yarn can come to rest and there% excess Compensate for the length of the track weight. As the demand grows, the yarn feed will be within a response time magnified in the order of thousandths of a second and vice versa. The response time to the above VerForm the changes can be made by changing the / surface on which the Yarn lies or the shape and number and direction of the air outlets, the air pressure, the rotational speed and generally all other elements of the device can be increased or decreased. If the textile machine doesn't have a Requires yarn, the feeder does not deliver it, although it does not change its speed. Under under these conditions, the yarn is released from the surface of the rotating element by means of an air cushion or -kissens, which avoids the risk of changing the properties of the yarn. Eliminated in particular the air with its cooling effect poses any risk of yarn heating.

209838/0900

22112QS

The yarn tension behind the feeding device when the textile machine does not need any yarn, i.e. the residual tension, is generally somewhat lower than the tension of the yarn in the feeding phase. However, it is possible To create feed devices for which the voltage prevailing behind them is independent of the feed requirement is, of course, except at the moment of launch.

The voltage in front of the device can vary greatly, without affecting the tension behind it in any measurable way. Also the influence that the voltage changes in front of the device on the voltage changes behind it may have depends on the device properties away. In particular, by changing the inclination of the air holes and the air pressure, To obtain feeding devices in which an increase in the voltage in front of the device results in a minimal increase the tension behind it and feeders that require an increase in tension in front of the device is even associated with a reduction in the voltage behind it, of course also here at Exception of the start.

In any case, it is possible to create feeding devices in which the tension in front of it is from a minimum Value that is required for uniform operation (e.g. 0, o5 g / den), up to the breaking point reio.ht,

209838/0900

without any measurable changes in the tension behind it.

The accompanying drawings show schematically some practical embodiments of the invention and serve to Explanation of the working method.

Fig. 1 shows a very schematic embodiment in the feeding state.

Fig. 2 is similar to Fig. 1 but shows the device when no yarn is being fed.

Pig 3, 4, 5, 6 and 7 show an embodiment with a rotary element in the form of a disk, namely in axial section, in a radially outer view, in an axial view, in section according to section lines VV and VI-VI according to FIG. "j and in a view similar to F1 &. ), with the components shown axially exploded.

8, 9 and Io show the perspective view, an axial view; and a cross section of one embodiment of an element in the form of a fan wheel.

Fig. 11 and II show a perspective view and a partial axial section of a treatise of the element in the form of a fan.

209838/0900

Pig. l ~ j and 14 show in shear nati shear view similar to Pig. 1, embodiments with differently directed air flows.

Pig. 15, similar to Pig. 4 shows a modification of the embodiment of the element in the form of a turntable.

Fig. 16 shows an example of a rotary member in shape a drum.

In the following description, the individual drawings are discussed while at the same time the mode of operation is explained. The main elements of the device are the following: A rotating element 1 with an outer surface for carrying or guiding the yarn F to be conveyed, the section 5Q- of which comes from a bobbin or another container possibly via friction elements, and the section 5b of which to the working machine or to an intermediate brake unit is conveyed on. The surface has a radius r- and is provided with a series of slots or openings. In the embodiment according to fflg. 1 and 2 radial openings 2 are provided, where * j denotes the axis of rotation of the rotating element. In Fig. I ^ and 14 instead of the radial slots 2 radial S-hlitze 112 and 122 are provided, which are opposite or / inclined with the direction of the tangential speed of the Drehelernentes, which is according to the arrow ν

- 9 -209638/0806

areht.

In a possible practical embodiment according to Figures J> to 7, the effective area 1 for the further conveyance of the yarn is formed with holes 2 on the groove bottom of a disk body, which consists of the elements 2olA and 2olB which, when assembled, form a cavity 4 , which is supplied with compressed air in order to generate air flows through the holes or slots, as they are designated by 2, which are directed outwards to the Umschlingungs- and Pörderoberflache 1.

In the modification of FIG. I5 has a disc body ^ o1 a corrugated annular groove which is an effective Surface IX results, which corresponds functionally to that designated by 1, but which also includes the yarn that is used by her is conveyed, deflects in the lateral direction, such that it is forced to rest against the walls and therefore the drag effect is increased. The modification according to FIG. 15 is particularly suitable for non-textured users Yarns or at least for yarns with a low coefficient of friction.

In Fig. 8 to Io a rotary member is shown which, as a fan wheel is formed, with a hub body 4ol, which has essentially radial or inclined rotating blades 4o2 is provided to prevent the formation of air

- Io -

209838/0900 Γ

μ ;

to achieve outward flows with at least one radial component. The rotating blades 4o2 can advantageously contain side blades 4o>, which facilitate the guidance of air in directions which are in the plane of symmetry transverse to the axis of rotation. The rotary vanes 4o2 have indentations 4o2A on the outer circumference, which represent support and contact points of the yarn ei & jL in this way formed rotary element. In the modified embodiment according to FIGS. 11 and 12, the fan wheel is asymmetrical, so that the yarn can also rest on its side wall in addition to the grooves. In any case, the blades or vanes of the fan wheel can be inclined radially or backwards or forwards, as is already provided for the holes 2.

As mentioned above, the feed device can essentially schematically simplified, as shown in Figs. 1 and 2, and it has one or more rotatable Surfaces, such as wheels or cylinders or disks or rotary vane wheels, as shown, for example, in FIG. 3 through 16 are shown.

In Fig. 1 and 2, the essential elements and the two interconnected extreme positions of the Yarn shown. The yarn F is wound around the support or rotating element, which is formed by a surface of revolution and much demanded. This edition 1 can be around

- 11 209838/0900

its axis 3> i ⁿ de * ^{1 in the} direction of the arrow fr and carries the yarn in the manner described below. The element 1, indicated in FIGS. 1 and 2, is shown as a ring with holes or slots 2 for the sake of simplicity. In practice, this support part can be a perforated or slotted (Fig. 16) cylinder, or the groove of a disc, which is provided with radially extending holes (Fig. 3 to 7) or radial slots, or a cylindrical metal mesh cage, or the series of bottom parts of radial indentations, which in a fan wheel (Fig. 8 to 12) or the like. are trained.

The support shown schematically at 1 need not be flat, but can be in the form of a regular Have polygons that are skewed and symmetrical to the plane of the drawing, except for a rotation that corresponds to one side, i.e., for example, the groove of the disk visible in Fig. 4 can have a corrugated or kinked profile contour be formed, which is therefore not in the plane of the drawing, as shown in Fig. I5.

The rotating element forms an inner space. If the rotating element is formed from a disc that is with radial holes is provided, their effective area will be the outline on the groove, and a cavity 4 will be in the Be formed inside the disc. If the turning

- 12 -

209838/0900

element by a cylinder, which is provided with slots is, or is formed by a cylindrical cage, the effective area of which is the outline of the cylinder or of the wires forming the cage, and the inner space will be the area or space that of the cylinder or cage. If the rotating element is an impeller, the effective portion of the rotating element becomes formed by the bottom parts of the indentations, which are arranged at the outer end of the fan blades, or of these and a lateral conical surface, as in the case of the asymmetrical impeller according to FIGS. 11 and 13 12, the interior being the area between the fan blades in the innermost part and the air outlet slots are the spaces between zones 4o2A of the blade ends.

According to FIGS. 1 and 2, the rotary element rotates in the Direction of the arrows fr, i.e. in the direction of conveyance of the yarn to the machine, with a peripheral speed that regarding the maximum speed; which may be required for the yarn, is around 5p # higher. In the area 4 the air enters, which has a pressure slightly higher than atmospheric pressure. In the case of disc cylinders or Cages or the like. this pressure must be supplied by a small compressor. In the case of a fan wheel or ^ 'chflüielrades can this pressure by moving the by yourself or by an oppression in the room outside

209833/0900

BAD LOCATION

of the room. The air emerges from this space 4 to the outside through the holes or slots 2. In Pig. 1 and 2, the slots 2 are arranged radially. However, they can be in different directions. In Pig. 13 there are shown schematically slots 112 from which the air comes out in a direction which is inclined with respect to the radius in the opposite direction of the rotation, which is always indicated by the arrow fr. In Pig. the slots 122 are inclined in the direction of rotation. In the schematic case of Fig. 13, the rotation of the rotary element can be achieved simply by utilizing the action of the air exiting the slots. If ν denotes the emerging air speed, it can be broken down _{into a radial component v rd} and a tangential _{component V + ._.} According to

Above

Pig. IJ) has the component v, a direction which is opposite to the peripheral speed of the rotating element. In Fig. 14, the component v. the same direction of the peripheral speed of the rotary element.

The yarn P from the reel (see Fig. 1) after a pass, if necessary, through suitable Frifctions couplings comes, is to the element 1 or the like. sinuous and carried along along an arc or one Polygon contour that starts at point A and ends at point B.

- lh 209338/0900

The point 3 will be variable, but it will always remain within the arc 5c, which is in Fig. 1, but can have any value below 360 °. At point "B, the yarn separates from the element 1 and lüuft of the supply location of the textile machine, either directly or possibly via suitable friction clutches. 5a designates the portion of the yarn E ^1, 'entering the Zuführriciitung. 5ab denotes the yarn portion from the Point A runs to point B and a rotating element 1 rests on it. 5b denotes the section of the yarn that runs from point 3 to the textile machine or other devices. 5c denotes the maximum arc in which the yarn can rest on the rotating element are denoted: with T ψ the yarn tension in area 5a, ie the section in front of the feeding device, with Tu> the yarn tension at a point on the arc AB, to which the angle γ corresponds, which is measured starting from point A; with Tb the yarn tension in Area 5b; ψ is the center angle for a running point, measured starting from the zero point formed by point A; ψ, is the center angle of arc AB.

As mentioned above, the feeder rotates at a constant speed. Regardless of whether the Machine requires yarn or not, the peripheral speed of element 1 is higher than the maximum

209838/0900 "

speed at which the yarn F is removed from the machine is removed.

It is useful to distinguish between three cases:

a) The machine "does not need any yarn. In this case there is a stationary phase.

b) The speed at which the feeder must deliver the yarn ranges from zero (previous case) up to a value as indicated by the machine is required. In more general terms, the yarn speed changes with the change the needs of the machine. In this case, there is a transition phase.

c) The machine needs the yarn at a constant speed . In this case there is a second "stationary phase".

Case a )

If the machine does not require any thread, the air exiting from the holes or slits 2 is sufficient to detach the thread from the element 1. The point B shifts to the point B ¹ , which coincides with the point A ^f (Fig. 2). The bearing pressure for sliding friction of the element 1 is missing and the yarn remains stationary and is through

- 16 209838/0900

supported by an air cushion. This phase can last indefinitely without any damage to both the yarn and the rotating element. The position of the yarn in relation to the rotating element is in Mg ·. 2, seen in the one that the yarn from the element 1 detached "remains. The Iioslösung of Garni ^s in the figure exaggerated for clarity shown. In Fig. 13 the position is shown lle the yarn in the F _a the rearwardly directed holes to emphasize the air transport effect.

GaIl b )

The feeder suddenly has to deliver yarn at the speed required by the machine. Analog and completely obvious is the case in which the speed is simply changed with which the machine needs the yarn.

The yarn F is initially in a state of equilibrium under the double effect of air lift and residual tension (Fig. 2). The demand for yarn by the textile machine causes a small increase in tension T- ^. That The tension-air thrust balance is disturbed and the yarn rests on the surface of the rotating element 1. Regardless of the point at which the yarn initially touches the surface, it receives one after contact fic / iub, i.e. a promotion effect in the feed direction.

- 17 -

208838/0900

ORIGINAL INSPECTED

As a result of this thrust, the yarn tension in front of the contact point increases further and all the yarn in front of the contact point comes to rest almost instantaneously on the surface of the element. Wherever the first point of contact has been, the yarn is quickly brought into the position indicated by the arc 5ab along which the yarn lies on the rotating element, the arc extending to a point B lying at such a point that the contact arc is sufficient to provide a drag force equal to T _& - T- _D , assuming that T _{& is} greater than T ^, which can easily be achieved with possible braking means on section 5a of the yarn. (This last condition, however, is not absolutely necessary. In fact, in all of the backward sloping holes (Pig. 11), T can also be smaller than T).

More precisely, along the arc AB in the direction from B to A, the tension increases according to the known exponential law Tp = T ^ .e ^{k (} fb "*> ^{up to the} tension Ta with which the yarn arrives at the rotating element, where the equation It is advisable to correct it in order to take into account the drag and deceleration by the air, the extreme variability of the coefficient of friction K, which depends on the creep speed and on the chemical-physical properties of the yarn, which in turn are influenced point by point by the abrasion as a result

- 10 -

209838/0900

1209

Creeping and the effect of the air and the like.

All of the aforementioned phenomena take place in a minimal amount of time. This time is hard to measure due to the complexity of the phenomena and their extreme variability. However, invoices show that it moves on the order of thousandths of a second. Confirm photographic controls these values.

Case c )

The machine needs yarn continuously and the feeding device is therefore in the working state. Assume that T is the optimum tension of the yarn at the inlet of the textile machine. If a friction is interposed between the feed device and the machine, which has a force T _f , then T ^ + T _f = T ₀ . If the yarn runs directly from the feeder to the machine, the tension should be T- ^ = T. The voltage Tu should therefore be constant and not greater than T. In modern machines for stockings and in textile machines, the optimal tension T is between 0.015 and 0.05 g / denier.

Since these values are certainly within the working range of the Feeding devices of the type described here are at very economical values of pressure

- 19 -.

209838/0900

and the consumption of air (0.05 to 0.2 atmospheres, 0.8 to 1.5 l / sec.), the condition T ^ ^ = T _{0 can} always be regarded as fulfilled ".

It will now be explained how the feed device according to the invention maintains the necessary constancy of Tv, even in the case of large changes in T ₀ .

el

The yarn reaches the rotating element 1 in A and is removed from the entire contact arc AB by the double action of Friction and the thrust of the air that emerges from the slots or openings 2 are carried along. In B dissolves the yarn from element 1. There is no sliding friction behind B and the air thrust drops quickly. The location of the Point B is characterized by the equality of force that the yarn exerts through the action of its tension the element 1 puts on, and the air thrust that seeks to take off. The centrifugal force should also be very precise take into account, but the latter is negligible due to the low weight of the yarn.

Let: 1, j be the radial component of the force which the air exerts on the unit of length of the yarn on element 1, and ¹ Sf is the yarn tension at the point under consideration. Then a yarn element is the two radial to each other

T. Δΐ

opposing forces ϊ ^ τ · ΔΙ and T. Subject to Δΐ, where r is the radius of element 1. j

- 2o -

209838/0900

_Solallge ψ & ϊ fd ^ -Δΐ

approx

^> rdL , lies the G - rn rait a force on the

^r Td "

Element 1 based on the unit of length

₍₁₎

r 3
amounts to. The voltage T ft, which is equal to T ₀ in A,

'el

decreases with the distance -from point A, ie with an increase in ψ. If at point B ₁ Τψ assumes the value of ^, so that _ ^ _ is equal to rdL , the yarn will

.r approx

lifted from the element 1 and the drag force exerted by the element 1 on the yarn as a result of the sliding friction , not applicable.

It is evident that changing T will change the length of the touch arc AB. As a result of the low weight of the track with regard to the forces that come into play, the response time, i.e.

the delay in the movement of B with respect to the change in T _a , can be neglected for all effects.

If the effect of the tangential component is neglected ! + "- r the force of air on the yarn, in (1), one can write for point B:

T _b = r. F _rdI (1)

- 21 -

209838/0900

from which, immediately the constancy of T ^ »if P ,, is constant, and the possibility of regulating the value of T ^ within certain limits by adjustment from F n-r yields.

In the case of the feeding device as schematically shown in Pig. i to'7 ».11» 12, 14 is shown, the setting of i'p ^ j is achieved by changing the air pressure in cavity 4. In other embodiments, which are based on the same principle as the fans and the like already mentioned, the setting P '-, y is achieved in a different way. In each pail, once S '^ j has occurred, it remains strictly constant and consequently T- ^ also remains strictly constant.

With the detachment and subsequent separation of the yarn from element 1, P _rc jr drops to zero. Below point B the yarn is therefore not subject to any tangential forces (^ + „τ is neglected), \ mu its tension remains constant and essentially equal to T,. If R denotes the radius of curvature of the yarn at one of its points P below B, one excludes:

R «F _rdi a T ₁₃ s const.

that after the decrease of P ₁ ^ j ₁ to zero R will grow to infinity. Pas yarn that goes from A to B according to a

- 22 -

209838/0900

Looping arc is arranged with a constant radius r, runs after the separation point 3 in a Curved line that merges into a straight line.

Ba point 3 is on the circumference of element 1 shifts to the change in T and the eventual

CA

Compensating for changes in the chemico-physical properties of the yarn is the curve along which that Yarn runs below B, continuously changeable. This could lead to the creation of standing waves lengthways of the running from the feeder on the machine The yarn section, but dampen the low weight of the stretched part of the yarn and, due to the air, relatively high friction these possibly occurring vibrations, so that they practically after a length of fade away a few r.

To simplify the explanation, only I? -, j considered without taking into account the fact that this depends not only on the inclination and the speed with which the air exits the slot, but also on the weight of the yarn stretched.

Since there are 3? _{r {} ij increases with the increase in the weight of the line, it follows from the above statements that the yarn is in the length sections of greater line weight

• -23 -

209838/0900

with a higher voltage T ^ emerges.

Since a larger line weight can be the result of irregular winding of the threads in a diverse yarn or irregular twisting in a single-thread yarn, it can be seen that the feed device according to the invention feeds the yarn with a practically constant line weight and tension. Indeed, in either case, the yarn can balance itself in the section running from the feeder to the processing site, and the greater tension has the effect of reducing the weight of the draw frame. It is useful to add that with a radius which is sufficiently high for the required speed of the yarn - for example r ^ 2 - 3 cm, ν ¹ ^ "2oo - 3oo m / min -» the compensation already in the area AB according to FIG 1 takes place.

The effects of the already mentioned variability of the coefficient of friction k, which is indeed large, become automatically and practically immediately compensated. One assumes:

T _a = <£ _h . e

Here T ^ is constant for (1) and (1 ^f ), 5? _a changes from bobbin to bobbin, as well as from point to point within a bobbin and generally depending on the history of the thread (which is a feed

- 24 209838/0900

device makes it necessary at all).

The value k changes with the chemical-physical scüen Conditions of the yarn and in particular with the surface heating as a result of the yarn friction on element 1, which is in the range of a few single-molecular layers.

For obvious reasons it is advantageous to work with a sufficiently high T, e.g. with O, o5 to 0.5 g / den. to ensure the highest possible uniformity of the yarn when entering the feeder. The magnification T is easily

el

to achieve present braking means. Obtained from (2)

= I. log ^ a

Point A is fixed. / ^ therefore depends only on point B, at which the yarn detaches itself from element 1, ie on the point at which T ψ the predetermined constant

Value 'J). If all possible states in front of the feed device are changed, point B on the circumference of element 1 is shifted under the sole condition that the relationships (1 ·) and (2) are always fulfilled, which ensure the required constancy of the tension. Ensure T ₀ , with which the yarn is brought to the feed device ¹ . For this purpose it is sufficient that cjio relation (3) is always fulfilled. So this

- 25 -

209838/0900

always occurs, a necessary and sufficient condition is that the arc 5c of FIG. 1 is large enough to contain all possible angles ψ. Nothing stands in the way of even a large enlargement of the arc 5c, whereby one can even use two or more elements 1 in a series if necessary. However, it is easier to use a geometry of the contact surface which reduces the maximum value of A by increasing the entrainment effect of the yarn by the rotating element 1. This geometry can be achieved, for example, by reducing the cross section of the groove of a contour disk element 1 or by forming the contact surface in the form of a broken line on an arcuate surface (FIG. 15) or in some other way. With such a geometry, the arc 5c can move between 180 and 270 ° and the safety range (ie the difference between the arc 5c and the maximum value of f ^ \ can be increased so that the constancy of T * up to the maximum value of Tension ^r ü "is guaranteed, which obviously corresponds to the value at which the G-rn breaks.

It is also important to observe that the feeding device according to the invention, although theoretically from is independent of the yarn properties, is particularly effective and adaptable with structural yarns. From formula (3) it can be seen that the changes

- 26 -

209838/0800

rungen of the ratio _f; only have a logarithmic effect on arc 5ab (arc AB). This means that even large changes in T _{a are} relatively small

Bring changes to the contact arc A-B with it.

So far, only the radial component of the force has been considered, which ^{1 from} the openings 2

exerting air on the yarn. Only qualitatively different effects of the air emerging from the openings 2 on the yarn will now be examined, the already considered effect of the self- adjustment due to Έ -, j being disregarded.

The first and most fundamental of these effects is the cooling of the yarn, or rather the very thin surface layer of the threads that make up the yarn. This effect is fundamental, because if it does not do so, the Yarn ara rotating element would melt and stick.

Another very important effect on which the power required of the feeding device depends is as follows: If ν is the air speed and is the angle between their direction and the radius, the force that the air exerts on the yarn will be in first and necessarily coarse approximation to be proportional to v, and with the same yarn with the stretch

209838/0900

2211203

the weight of the yarn element on which the air acts increase »The vector ν can be divided into its tangential and Radial component disassembled v / earth *

v. = ν. sin i and ν _d = s ν. cos

One can immediately see that the total force F _{T exerted} by the air on the yarn, in the case of the backward-facing slots, has the effect of reducing the drag effect, at least from the point in time when the resulting speed of the algebraic Sum of v. and the peripheral speed

"Cg

speed of the rotary element is smaller than the yarn speed .

As for the section after Ii, the effect is by F. τ counteracts the entrainment, and is meaningless for the reasons already mentioned.

In 3ogen AB, however, F.. _{T has} the effect of increasing the tension of the green entering the textile machine, with double the result:

1) Increase in voltage T-. equal to the air pressure in chamber 4 »

2) Enhancement of the yarn peeling accuracy

from the rotary element 1, also equal to the pressure in the Chamber 4

209838/0900

In the pall of radial openings, this second result can be achieved with an acceptable margin of safety a mere change in air pressure can be achieved in 4.,

The inclination of the openings allows the same Safety zone with remarkably smaller pressures and can therefore be achieved with significantly lower air consumption and costs.

2 iHJ Ö 3 8 / G 9 0 U

Claims (1)

Claims 1. Gas supply device, in particular for structural yarns, characterized in that a turning lenient (I) that rotates 3ich in the Ii'örderrichtung uncf around the
Kii conveying yarn (F) with a partial wrap
running, comprising means for generating air flow provided la U, d: ie at least one Zentrifugalkornponente have UNRL to the yarn act in such a way that it is tensioned and "I dissolves vota Dreheloiiient for a Uiuriciilingungsbogen, the ^{l (tn} depending on the üpannuuß before Rotary element and from the Grirnbesohaffeniieit changes, so that you get a tension and a scattering weight behind the original element!
of the tension "unJ - iinieriialb £; ewisser limits - also voii Ükrecikengewiohb, which are herrsclion, un. üjiuirigig in front of the rotating element. 2. Device no.ch Anspruoh !, thereby geke η η - • Δ u L ν. h η et that tyLo \\ , kifs .iJpeliuiornont (l) dfeht continuously and with constant speed, uit oiuet ¹ Urafanggttiiol Speed, the larger ri.lo diο Maxima Lc Gartiiuiführgeach Speed igt. 209838/0 * 900 3 · Device according to claim 1 and 2, characterized g e Ic e η η s e i c Ii net that when there is no yarn feed the G-arn ('J?) by the action of the thrust the centrifugal air remains lifted from the rotating lenient (1). 4 · Yorrietitung according to claim 1 to 3, characterized characterized in that the rotary element ("1) is designed as an Ilillenseheibe, in the groove bottom Holes or slots (2) are provided from which air exit. 5. Apparatus according to claim 1 to 3 »thereby g e k e η η ζ eic h η e t that the Drehelernent as Fan wheel is formed, the wind blades on their Circumferential edge indentations on v / iron to accommodate the yarn and to guide, the fan wheel blowing in a centrifugal direction (lig. »to 12). 6. Apparatus according to claim 1 to 3 »thereby g e k e η η ζ e i c h η e t that the rotary element (1) is designed as a roller-shaped cage or as a cylinder which is provided with suitable air slots (Pig. 16). 7. Apparatus according to claim 1 to 6, characterized in that the G-arn (l ¹ ) to dcis V. 1 209838/0900 ORIGINAL BATHROOM Ureheleiaent in a perpendicular to the axis of rotation (3) of the Dreheleuentes lying level is performed or not oneiu Course that does not lie in such a plane, but rather, for example, from individual ones against one in dioser axial direction Flat lying path, inclined sections consists. β. Device according to claims 1 to 7, dadurcn g e]: e η η ζ ο i c h η e t that of one place from the Drelieleraent exiting Lu Ct st ro η to the Kedialrichtung is inclined to a Velocity Contiiponeiite with respect to the rotor to form that with the G-arnzuiiUir direction coincides with or opposite direction iot. 209838/0900 BATH ORIGINAL