GB2321651A

GB2321651A - Producing interlaced yarns

Info

Publication number: GB2321651A
Application number: GB9702087A
Authority: GB
Inventors: Erwin Schwarz; Gotthilf Bertsch
Original assignee: Heberlein Fasertechnologie AG; Heberlein and Co AG; Heberlein Maschinenfabrik AG
Current assignee: Heberlein AG; Heberlein and Co AG
Priority date: 1997-01-31
Filing date: 1997-01-31
Publication date: 1998-08-05
Anticipated expiration: 2017-01-31
Also published as: GB9702087D0; DE19703572A1; GB2321651B; DE19703572C2

Abstract

In the supply line 11 feeding compressed fluid to an interlacing nozzle 1 for yarn a controllable shut-off valve 20 is provided so as to produce pulses of fluid pressure resulting in a pattern of knots along the yarn. The valve may be electromagnetic under electronic control and may be operated in a regular repeat or a random mode. Two valves may be associated with a single nozzle or two nozzle/valve units may be provided in series.

Description

1 2321651 METHOD AND ARRANGEMENT FOR pRODuCING AN INTERLACED YARN a method

and) This invention relates tora-narrangement for producing interlaced knots (interlaced parts) on a yarn by air interlacing in an interlacing nozzles with a stationarily arranged compressed air supply orifice.

Regarding to smooth or textured multifilament yarns. there is a frequent desire to subject the yarns to treatment with the aim of increasing of the cohesion of the filaments and simplifying further processing of the yarns. for example. during takeoff from the bobbin, weaving, or knitting. Air interlacing is a very advantageous process. The traveling multifilament yarn is subjected to the action of a compressed air jet impinging perpendicularly or almost perpendicularly onto the yarn via a compressed air supply orifice produces intermittent mixing of the filaments, and interlaced points (also known as knots or fixing points) is created on the yarn. The cohesion of the filaments at these interlaced points depends on the friction between the filaments and is generally so strong that it cannot easily be opened again. The interlacing process is as follows. The filament assembly of the traveling thread in the yarn channel opens in the form of a bubble over the airstream from the compressed air supply orifice. Owing to the two partial stream vortices being formed, the filaments are set into rotation in opposite directions within the yarn duct to the left and right of the transverse orifice. Intertwined filaments or interlaced knots are therefore created 2 before and after the compressed air supply orifice. If the interlacing point formed opposite the air supply orifice now leaves the yarn duct, rotation of the individual filaments is stopped owing to the local intertwining. Unintertwined filaments again appear in the nozzle owing to the forwarding of the thread. ' The process therefore begins from the start. Interlacing as such is a discontinuous process whereas yarn passage is continuous.

Interlacing is assessed, among other things. by means of the interlaced points per length unit of the yarn. This can be carried out, for example. by measuring the thickness of the yarn. The criteria of interlacing density, interlacing uniformity and interlacing stability are particularly important criteria for propagation. The number of interlaced points per meter of the yarn is counted for the interlacing density. However, the interlacing density does not give any information about the individual intervals between the individual interlaced points. Only the maximum and minimum values of the opening lengths are generally determined for the interlacing uniformity. The maximum of uniformity is desired. The interlacing stability is also an important quality criterion. Interlacing has to maintain the yarn closure relative to the yarn pulling forces occurring during processing. The interlaced points must not open during further processing. Interlaced points of different hardnesses are required according to the application, and this is achieved by the specific construction of the interlacing nozzle and also by the choice of the value of the static starting pressure of the air supply. for 3 example from 1 bar to 5 bar.

The interlaced knots are formed on the yarn which is conveyed continuously through the interlacing nozzle at speeds of, for example, 300 to 1.500 meters per minute. without any part of the interlacing nozzle moving. The compressed air supply orifice is not moved either and the incoming compressed air is not pulsated. The interlacing knots are the result of the dynamics produced between the moving filament yarns and the compressed air or compressed airstream. As with any industrial process, an optimum between the necessary quality criteria on the one hand and the through-rate of the yarn on the other hand is also sought here.

The through-rate or speed of conveyance of the yarn indicates the efficiency of the entire arrangement. Continuous, high-frequency, uniform or periodic interlacing, in particular. is required by individual processors. DE-OS No. 41 40 469 proposes a method in which knots and intertwining are imparted uniformly to the yarn, and the nozzle is designed as a rotating rotor nozzle and is provided with at least one or many nozzle orifices or compressed air supply orifices.

Recently. it has been proposed to use different yarns together using the above-described interlacing technique in order to provide a woven fabric and knitted fabric having a variable surface. For the purpose, the different yarns are interlaced and combined, or they are paralleled. For example. Japanese Published Unexamined Application (Tokkai-Hei) No.219529 discloses to arrange interlaced parts and uninterlaced parts irregularly in the 4 longitudinal direction by intermittently blasting pressured fluid to an interlacing nozzle.

The conventional interlaced yarns, however. are uniformly combined since the uninterlaced parts are short. Thus. the surface patterns of the woven or knitted fabrics become minute. A simple drawing process provides drifting grandrelle and rough grandrelle. However., control is difficult in manufacturing, and the grandrelle is not repeated well. The great drawback of the German reference is that the entire rotor mechanism is expensive and necessitates high maintenance costs. The interlaced yarn disclosed in Hei 219529 also has some problems. For example. the nozzle is not directly connected to the valve. Thus, during interlacing with pressed air, the timing for switching on/off the nozzle tends to be shifted. As a result, satisfactory variation is not obtained. Therefore, the straight part of the yarn is too long. thus the grandrelle becomes rough when the yarn is made to be a woven or knitted fabric. since the spindles are easily differenciated. Furthermore, the yarns are varied to make the fabric bulky. the longer yarn is displaced at the straight parts because of the friction with a guide. and neps are created at the interlaced parts.

In order to solve these and other problems, this invention has set itself the object of producing or controlling not only the necessary quality criteria. for example the uniformity of knot formation, but also an optionally intentionally selectable random knot sequence. in order thus to give the yarn or the end product J produced from it a special ornamental effect owing to the knot repeat, if desired. Another aim of this invention is to provide an interlaced composite yarn which feels bulky and fluffy. Such a yarn can be made to a woven or knitted fabric with constantlyvaried surface.

In order to obtail the above-mentioned aims and advantages a method of interlacing at least one yarn wherein the yarn is supplied with overfeed to an air interlacing nozzle at 300 to 1500 metres per minute, characterised in that the valve opening time for the interlacing air is controlled independently of a closed time via a controllable shut -'f valve directly preceding the air interlacing nozzle and a selectable knot repeat is produced.

An arrangement of this invention provides interlaced yarns by blasting compressed air from its interlacing nozzle having a compressed air supply orifice to its yarn duct. The arrangement has shut-off valves which are incorporated with or adjacent to the arrangement. The valves also belong to the compressed air supply line. Compressed air is blasted from the interlacing nozzle to the yarn duct via the shut-off valves.

It is preferable that the shut-off valves provided with a means to control the valve switching which can be operated by a pulse train controller, so that a selectable knot repeat pattern is produced.

It is also preferable that air interlacing comprises an interlacing nozzle with at least two preceding controllable shutoff valves which are independently actuable via a pulse train controller to produce a selectable knot repeat.

It is further preferable that plurality of arrangements which have shutoff valves incorporated therewith are arranged in serious.

It is preferable that the shut-off valves comprise plungers at coils and inside the coils. and the plungers travel when the 6 coils are supplied with electricity. so that the compressed air is stopped by the diaphragm valve which is located in the plunger's moving direction.

It is further preferable that the valve opening time is controllable via the controller independently of the closure time.

It is preferable that the controller is allocated a frequency controller for producing a selectable repeat length and adjusting means for the valve opening time or times within a knot repeat.

It is preferable that the knot sequence is determined at least in part by a random number generator.

It is also preferable that the at least one knot repeat pattern is established by at least one means selected from the group consisting of rigidly predetermined knot repeat patterns and a free program.

It is also preferable that a specific knot repeat pattern is defined or produced and stored for optical repeatability on the same yarn or subsequent use for production of an identical knot repeat pattern.

It is preferable that the control device has an electronic control system for the interlacing nozzle which are combined in groups.

It is preferable that the control device has a memoryprogrammable computer from which control chains can be called up for recipe-orientated production of repeats and can be transmitted to the electronic control systems for producing the respective 7 concrete knot repeats.

It is preferable that the controllable shut-off valve and the interlacing nozzle form a structural component. and the outlet of the shut-off valve is connected directly to the compressed air supply orifice.

It is preferable that the controllable shut-off valve is designed as a pre-controlled 2/2 way diaphragm valve while the valve outlet and the compressed air supply orifice are orientated at least substantially identically.

It is preferable that the electronic control system comprises several parallel signal outputs, several compressed air valves with associated interlacing nozzles being controllable simultaneously via each signal output.

It is preferable that the arrangement comprises a memory computer from which several electronic control systems with identical or different recipes for knot repeat patterns can be controlled.

It is preferable that the arrangement comprises a feed unit for constant yarn overfeed.

It is preferable that the overfeed rate of the arrangement ranges from 0. 8 to 5%.

It is also preferable that yarn guides are provided to the interlacing nozzle for the purpose of fixing the yarn pulsation and that the yarn guides are set at two portions of inside or vicinity of the nozzle.

According to this invention. random knot sequence can be 8 produced or controlled, and therefore, a particular ornamental effect are given to the yarn or the end product due to the knot repeat patterns. The obtained yarn feels bulky and fluffy. thus the woven or knitted fabric of the yarn constantly has a varied appearance.

FIG. 1 is a cross-sectional view of an interlacing nozzle arrangement of one embodiment of this invention.

FIG. 2 shows a yarn produced using an arrangement of one embodiment of this invention.

FIG. 3 is cross-sectional view of FIG. 4 along the line I 1, which indicate the movement of a yarn in the arrangement of one embodiment of this invention.

FIG. 4 is an explanatory view to show the movement of a yarn in an arrangement of one embodiment of this invention.

FIG. 5 is a graph to indicate the measuring result of the thickness of the yarn obtained in one embodiment of this invention.

FIG. 6 is a graph to indicate the measuring result of the thickness of the yarn obtained in another embodiment of this invention.

FIG. 7 is a graph to indicate the measuring result of the thickness of the yarn obtained in still another embodiment of this invention.

FIG. 8 shows an example in which two shut-off valves are incorporated with an interlacing nozzle of one embodiment of this invention.

FIG. 9 shows an example in which two interlacing nozzles of 9 one embodiment of this invention are arranged in series.

FIG. 10 is an explanatory view to show how to control the arrangement of another embodiment of this invention.

The air interlacing arrangement according to a preferable embodiment of this invention has an interlacing nozzle with a preceding controllable shut-off valve which can be actuated to produce a selectable knot repeat pattern via a pulse train controller.

This invention allows interlacing technology, formerly employed primarily as a production aid, also to be used for a creative purpose. for a particular ornamental effect without the former quality criteria having to be abandoned. For example, if the pulse train controller is set to continuous operation, the interlacing nozzle operates as in the prior art. However, a special knot repeat pattern can be produced on the yarn with the pulse train controller.

This invention also allows a number of particularly advantageous features. The valve opening time is preferably controlled via the controller independently of the closure time. "Valve open" denotes the production of a number of knots which is possible according to the duration of the opening time. Knot formation is interrupted by closing the valve. A very simple solution is achieved if the controller is allocated a frequency controller for producing a selectable repeat length and adjusting means for the valve opening time or times within a knot repeat. A complete set of valves can be controlled by inexpensive electronic components and, for example. the desired frequency and the valve opening time can be adjusted as desired, for example via a respective potentiometer. Depending on the desired fabric pattern or the desired knot repeat, it may be advantageous if the knot sequence is determined at least in part by a random number generator. However, it is also possible to select one or more knot repeats from a number if rigidly defined knot repeats and/or to determine them according to a free program.

If a very high frequency is required for the repetition of the knot repeats. it may be very advantageous if the air interlacing comprises an interlacing nozzle with at least two preceding controllable shut-off valves which can be actuated independently to produce a selectable knot repeat via a pulse train controller. According to a second possibility, air interlacing comprises at least two interlacing nozzles with a respective preceding controllable shut-off valve which can be actuated independently to produce a selectable knot repeat via a pulse train controller. The two measures allow a corresponding increase in the speed of conveyance when the shut-off valves or the interlacing nozzles (with a respective shut-off valve) are doubled or multiplied. with an identical repeat length with respect to the absolute length dimension in cm.

In practice. a specific knot repeat desired by the customer is preferably produced and defined. To enable the knot repeat pattern to be exactly reproducible for an optical length in the sequence. the timed pulse train, once found, can be stored for 11 "valve open/close- and can be called up at any time in terms of recipe for the subsequent production of the identical knot repeat. It has proven very beneficial if the control direction for interlacing nozzles combined in groups has an electronic control system. A plurality of parallel yarn paths can therefore be interlaced simultaneously without very great expenditure. It is also proposed that, for higher requirements, the controller have a memory-programable computer from which control chains for recipeoriented production of repeats can be called up and can be transmitted to the electronic control systems for producing the respective concrete knot repeats.

A controllable shut-off valve and an interlacing nozzle preferably form a rigidly connected structural component, the outlet of the shut-off valve being connected directly to the compressed air supply orifice of the interlacing nozzle. A precontrolled 2/2 way diaphragm valve is used as controllable shut-off valve, the valve outlet and the compressed air supply orifice being oriented at least substantially identically. The electronic control system preferably comprises several parallel signal outputs, several compressed air valves with associated interlacing nozzles being controllable simultaneously via each signal output. For a larger installation, the arrangement comprises a memory computer from which several electronic control systems with identical or different recipes for knot repeat patterns can be controlled.

Experiments have shown that the arrangement should have a 12 feed unit for a constant yarn overfeed, preferably with an overfeed of 0. 8 to 5%. The constancy of the quality of the interlacing, in particular, should also thus be ensured. the interlacing nozzle particularly preferably being arranged between two feed units.

This invention will now be described with reference to some embodiments with further details. FIG. 1 is an explanatory view of cross section of an interlacing nozzle of one embodiment of this invention and its control system. A shutoff valve 20 is directly connected to a compressed fluid supply line wall 11 of an interlacing nozzle 1. The shut-off valve 20 is provided with a solenoid 23 composed of a coil 21 and a plunger 22. When electricity is given to the coil 21, the plunger 22 moves to the left. The end of the plunger 22 travels a diaphragm valve plate 24 having a portion 25 made of rubber or metal to the left, so the diaphragm valve plate 24 bumps into a protruding portion 27 which protrudes to the compressed fluid supply line path. As a result, supply of the compressed fluid is stopped. A control line 14 is connected to terminals (12, 12') of the coil 21. The control line 14 is connected to a control distributor 15 and receives control signals from a computer PC. Numeral 26 is a plug fixed to a housing. The control distributor 15 can freely select its valve switching cycle and its blast time by using a potentiometer P 1 or P 2 The control distributor 15 is also connected to other interlacing nozzles including 1' and 1" by other control lines.

Compressed fluid 5 (e.g. compressed air) is supplied from a supply line 10. When the shut-off valve 20 is opened. the fluid 13 passes a valve outlet orifice 13 and blasted to a yarn duct 3 of an interlacer via an interlacing orifice 4. The volume of the valve outlet orifice 13 and of the interlacing orifice 4 should be reduced as much as possible in order to keep a certain degree of response speed for switching the shut-off valve 20. The part is from the switching position of the shut-off valve 20 to the blast position at the yarn duct 3. In other words, it is the volume of the part from where the diaphragm valve plate 24 bumping into the protruding portion 27 to the outlet of the interlacer orifice 4. More specifically, the volume should be 10 milliliters at most. I is more preferable that the volume is 5 milliliters or less. It specifically preferable that the volume is 3 milliliters or less. In this embodiment, the volume is predetermined to be about 1.1 milliliters. It is preferable that the valve outlet orifice 13 and the interlacing orifice 14 are connected each other in a straight line.

The supply yarn 2 is supplied from a feed nip roller ZI, 1 to the yarn duct 3 of the interlacing nozzle 1. The supply yarn 2 becomes a partial interlaced yarn P, and taken into a discharge nip roller AL 2 and taken up by a bobbin (not shown). The rotation speed of a feed nip roller ZI, 1 can be increased to overfeed between the feed nip roller ZI, 1 and the discharge nip roller AL 2 The overfeed rate can be predetermined to be 0. 8 to 5% as an example. Guides (8, 9) are formed inside the interlacing nozzle 1. The guides are used as fulcra to pulsate the fibers.

FIG. 2 is a schematic view showing the interlaced composite S 14 yarn obtained by using the arrangement of FIG. 1 of one embodiment.

In FIG. 2. 31 are interlaced parts. and 32 are open parts between two interlaced parts. 33 and 34' are combined parts composed of the interlaced parts and open parts. 34 and 34' are straight parts. and 30 is an interlaced composite yarn. The average length (mm) of the straight parts (34. 34') preferably ranges from 30mm to 110Omm. The product of "the average length of the straight parts" and "the ratio of length difference of plural kinds of multifilament fibers composing the straight parts" preferably ranges from Omm to 30mm.

FIGs. 3 and 4 show the movement of the filament single yarn in the interlacing nozzle 1. FIG. 3 is a cross sectional view of FIG. 4 along line 1 -1. As indicated with arrow 5, compressed air is blasted from the interlacer orifice 4 to the yarn duct 3 using pressure of from 1 to 4 bar. or higher pressure. The blasted air is divided into partial vortices 6 and diffuses in the air. The filament single yarn accompanies the partial air vortice 6, and is pulsated (ballooning). Interlaced parts are formed on both sides of the open parts. As a result. a filament yarn having interlaced parts 31 and open parts 32 by turns in the longitudinal direction is formed. If the compressed air is not supplied for a certain time. the part becomes straight part 34.

FIGs. 5. 6 and 7 are graphs to indicate three measuring results of the thickness of the yarns obtained in the following embodiments. The graphs show the results of measurements of the thickness of the yarns (bulkiness). The peaks are interlaced points, and the bottom lines are open parts. In FIG. 5, To 1 is the time in which the shut-off valve is open. Three interlaced parts (M) are formed during this time. The short valleys between two interlaced parts are open parts. Tg, is the time in which the shutoff valve is closed, where the straight parts are formed. The intervals between To 1 and Tg, are repeating cycles (xl). Unlike FIG. 5, each repeating cycle (x 2) of the graph of FIG. 6 is long, and eight interlaced points (M) are formed during the shut-off valve is open. T92 is the time in which the shut-off valve is closed and to the straight parts are formed. This time is also long. In FIG. 7, the number of the interlaced parts varies at random in the repeating cycle (x 3), and the straight points are relatively short.

In the yarn according to FIG. 5, three interlacing knots 3K are formed respectively during a very short opening time To 1 with an interval Tg, between each group of three interlacing knots. "To" denotes the time duration of the open valve-position, "Tg" the closed valve position. A time interval "To" as well as a time interval "Tg" together form a respective repeat (X). According to FIG. 5, the repeat X1 is repeated until the yarn to be finished has been processed. The specific repeat (Xl. X2, X3, etc.) can be stored and can be used again for subsequent manufacture of the same yarn, as shown hereinafter. In contrast to FIG. 5. FIG. 6 shows a longer repeat X2. The valve opening time To 2 is longer. Eight knots 8K are formed each time. The knot-free interval T92 is also optionally repeated. FIG. 7 shows an interplay of knots and short 16 knot-free intervals with a repeat length X3. The repeat length can be assumed as a cycle for the control operation.

In the simplest case according to FIGs. 5 and 6, the repeat can accordingly be formed by a simple frequency controller with selectable valve opening time in the form of a quite simple electronic control unit.

FIG. 7 is somewhat more complicated in terms of control as several variations are carried out within a repeat. A simple computer/memory unit can be advantageous here, particularly if the variations are to be selectable without restriction. In the simpler case (FIGs. 5 and 6), any frequency corresponding to the repeat length X can be inputted, as well as the desired blast time.

The repeat length can be any desired dimension. In practice, it will be. for example, between 10cm and 100cm. The length of the uninterrupted interlacing knots (width) can also be of any desired length within a repeat. The formation of an individual knot is the theoretical minimum for the blast time and practical values for interlaced portions are. for example. 2 to 30cm. If timing is selected for the repeats or interlaced length (for example, 70 Hz 10ms). the effective yarn speed also has to be calculated in the computers so concrete lengths in cm are obtained for the repeats. Any other desired parameter can obviously be used to control the pulse train, for example. optical detection for monitoring the quality of the knot repeat. The invention allows the preliminary definition of the repeat or, for example, of the control via a random number generator or both in any combination. It is also 17 conceivable that a special or random sequence of special complete repeats is also desired. There are only two concrete limiting factors for this. The minimum lies with one or two individual knots and a specific number of knots which is required for ensuring processing in each individual case. A further possibility resides in the fact that. in addition to valve opening and valve closure, the pressure is also controlled as a further parameter, whether through particular control of the valve, for example only partial opening, or through an additionally controlled pressure reducing valve.

FIG. 8 shows an interlacing nozzle 1 to which two shutoff valves (20, 20') are connected and incorporated with. According to this embodiment, the stroke length of the solenoid is half as that of FIG. 2. Therefore. the yarn speed can be improved to be as twice as that of FIG. 2 when the identical process is carried out.

FIG. 9 shows an embodiment where the incorporated interlacing nozzle 1 and the shut-off valve 20 are serially arranged in the yarn longitudinal direction. In this embodiment too. a varied yarn is obtained.

As frequencies for knot repeat formation which can no longer be obtained from a valve with its specific construction can be demanded in practice. an increase can be effected either by double or multiple use of precontrolled valves on the same interlacing nozzle according to FIG. 8 or by the double or multiple use of entire interlacing nozzle corresponding to the efficiency according to FIG. 9. In practice, this means that. for example.

18 with an arrangement which achieves a repeat of 10cm length. which is as short as possible. at a yarn conveying speed of 500m/min., while doubling all the interlacing nozzles or only the precontrolled valves, the same repeat length of 10cm can be achieved at a yarn conveying speed of 1000 m/min. One or other variation can be selected depending on whether the valve switching time or the air volume between the valve and the yarn duct is the limiting factor.

FIG. 10 essentially shows the schematic view of the embodiment shown in FIG. 1. In FIG. 11, the control distributor 15' has greater efficiency and controls an entire group of pre controlled valves 10, 10' etc. from each control output 16.

19

Claims

A method of 1.nterlacing at least one yarn wherein the yarn is supplied with overfeed to an air interlacing nozzle at 300 to 1500 metres per rninute, characterised in that the valve opening time for the interlacing air is controlled independently of a closed time via a controllable shutoff valve directly preceding the air interlacing nozzle and a selectable knot repeat is produced.

2. Arrangement for producing interlaced yarns by blasting compressed air from its interlacing nozzle having a compressed air supply orifice to its yarn duct, and the arrangement has shut-off valves which are formed at any parts of a compressed air supply line and incorporated with or adjacent to the arrangement. so that compressed air is blasted from the interlacing nozzle to the yarn duct via the shut-off valves, preferably according to claim 1.

Arrangement according to Claim 2, characterized in that the shut-off valves are provided with a valve-switching control means to form selectable knot repeat patterns. and the control means can be operated by a pulse train controller.

4. Arrangement according to Claim 2, characterized in that air interlacing comprises an interlacing nozzle with at least two preceding controllable shut-off valves which are independently actuable via a pulse train controller to produce a selectable knot repeat (Figure 8).

5. Arrangement according to Claim 2 or 3, characterized in that a plurality of the. arrangements are arranged in series and the arrangement are incorporated with or adjacent to the shut-off valves.

6. Arrangement according to Claim 2 or 3 characterized in that the shutoff valves have plungers at coils and inside said coils. and said plungers travel when said coils are supplied with electricity. so that the compressed air is stopped by the diaphragm, 7. Arrangement according to Claim 3, characterized in that the valve opening time is controllable via the controller independently of the closure time.

8. Arrangement according to Claim 3 or 7, characterized in that the controller is allocated d frequency controller for producing a selectable repeat length and adjusting medris for the valve opening time or times within a. knot repeat.

9. Arrangement according to one of Claims 2 to 8, characterized in that the knot sexpence can be determined at least in part by a random number generator.

10. Arrangement according to one of Claims 2 to 9, characterized in that at least one knot repeat pattern is established by at least one mea-ns selected from the group consisting of --,^igidl.y predetermined knot repeat patterns and a free programs.

11. Arrangement according to one of Claims.7_ to lo, characterized in that a specific knot repeat pattern is defined or produced and stored for optional repeatability on the same yarn ur for subs,equent use for production of an identical kaot repeat pattern.

12. Arrangement according to one of Claims 2 to ii, characterized in that the control device has an electuonic control system for interlacing nozzles which are combined in groups.

1,. Arrangement according to one of Claims 2 to 12, characterized in that the control. device has a memory-programmable computer from which control chains can be called up for recipe-orientated production of repeats and can be transmitted to the electronic control systems for producing the respective concrete knot repeats.

21 14. Arrangement according to one Of Claims 2 to 13, characterized in that the controllable shilt-Off valve and the interlacing nozzle form a structural component, and the outlet of tlip shut-off valve, being connected directly to the compressed air supply orifice.

15. Arrangement according to one of ClaimS 2 to 14, characterized in that the controllable shut-off valve is designed as a precontrolled 2/2 way diaphragm valve. the valve outJet &id the compressed air supply orifice Lx->ing at least substantially identically oriented.

16. Arrangement according to one of Claims 2 to '15, characterized in that the electronic control system comprises several parallel signal outputs, several compressed air valves with associated interlacin- nozzles bciiia controllable simultaneously via each signal output.

17. Arrangement according to on(-- of Claims 2 to 16, characterized in that it comprises a memory computer from which several electronic control systems with identical or different recipes for knot repeat patterns can be- controlled.

18. Arrangement according to one of Claims 2 to 17, characterized in that it comprises a feed imit for constant yarn overfeed.

1.9. Arrangemcin according to claim 18, characterized in that the overfeed rate ranges from 0.8 to 5%.

20. Arrangement according to one of Claims 2 to 19, characterized in that yarn guides are provided to the interlacing nozzle for the purpose of fixing the yarn pulsation, and the yarn guides are set at two portions of inside or vicinity of the nozzle.

I:L Amendments to the claims have been filed as follows 1. An arrangement for producing interlaced yarns with an interlacing nozzle having a compressed air supply orifice to its yarn duct, the arrangement having a shutoff valve which is part of a compressed air supply line, such that compressed air is blasted to the yarn duct via the shut-off valve, the valve opening being controllable by a frequency controller, wherein the shut-off valve is a pre-controllable valve and the frequency controller has adjustment means for the control of the valve opening time independently of a closure time within the knot repeat for the production of a preselectable knot repeat.

2. Arrangement according to claim 1, wherein the outlet of the shut-off valve is connected directly to the compressed air supply orifice.

3. Arrangement according to claim 1 or 2, wherein the shut-off valve and the interlacing nozzle form a structural component.

4. Arrangement according to one of claims 1 to 3, wherein the precontrolled valve is a diaphragm valve.

5. Arrangement according to any one of claims 1 to 4, wherein the shutoff valve is a precontrolled 212 way diaphragm valve, the valve outlet and the compressed air supply orifice being at least substantially identically oriented.

6. Arrangement according to claim 5, wherein the shut-off valves have plungers at coils and inside said coils, said plungers being adapted to travel when said coils are supplied with electricity such that the compressed air is stopped by the diaphragm.

7. Arrangement according to claim 1, wherein a plurality of the arrangements are arranged in series and the arrangements are incorporated with or adjacent to the shut-off valves.

8. Arrangement according to any one of claims 1 to wherein yarn guides are provided for the interlacing nozzle for the purpose of fixing yarn pulsation, and the yarn guides are set at two positions inside or in the vicinity of the nozzle.

9. Arrangement according to claim 1. wherein the shut-off valves are provided with a valve- LL.t switching control means to form selectable knot repeat patterns, and the control means is adapted to be operable by a pulse train controller.

10. Arrangement according to claim 1, wherein an interlacing nozzle is provided with at least two preceding controllable shut-off valves which are independently actuable via a pulse train controller to produce a selectable knot repeat.

11. Arrangement according to any one of claims 1 to 10, wherein the control means has an electronic control system for interlacing nozzles which are combined in groups.

12. Arrangement according to any one of claims 1 to 10, wherein the electronic control system comprises several parallel signal outputs, several compressed air valves with associated interlacing nozzles being controllable simultaneously via each signal output.

13. Arrangement according to any one of claims 1 to 12, further comprising a memory computer from which several electronic control systems with identical or different recipes for knot repeat patterns can be controlled.

IIS14. Arrangement according to claim 1, wherein the controller is allocated a frequency controller for producing a selectable repeat length of between 2 to 100 cm and adjusting means for the valve opening time or 5 times within a knot repeat.

Arrangement according to any one of claims 1 to 14, wherein the knot repeat can be determined at least in part 10 by a random number generator.

16. Arrangement according to any one of claims 1 to 15, wherein at least one knot repeat pattern is established by is at least one means selected from a group consisting of rigidly predetermined knot repeat patterns and a free program.

17. Arrangement according to any one of claims 1 to 15, characterized in that a specific knot repeat pattern is defined or produced and stored for optional repeatability on the same yarn or for subsequent use for production of an identical knot repeat pattern.

18. Arrangement according to any one of claims 11 to 17, wherein the control means has a memory-programmable computer from which control chains can be called up for recipeorientated production of repeats and can be transmitted to the electronic control systems for producing the 5 respective concrete knot repeats.

19. Arrangement according to any one of claims 2 to 18, further comprising a feed unit for constant yarn overfeed at an 10 overfeed rate ranging from 0.8 to 5%.

20. A method of intermittently frequency controlled interlacing at least one yarn with a knot repeat wherein the yarn is supplied with overfeed to an air interlacing nozzle at 300 to 1500 metres per minute, wherein within a knot repeat the valve opening time for the interlacing air is controlled independently of a closed time via a pre-controllable shut-off valve directly preceding the air interlacing nozzle and a free20 selectable knot repeat is produced.