EP0092511A2 - Method of producing a snarl-free yarn, and a spooling machine - Google Patents

Abstract

On winding machines and the like, curls occur when the thread tension decreases. By reducing the angle α of the thread (25) to the bobbin end face (213), the friction of the thread (25) on the bobbin edge can be increased to such an extent that even when the thread tension is released, no turns on the bobbin surface detach and curl. The angle α can be reduced by lowering the thread eyelet (24) towards the spool (23), by lifting the spool (23) or by deflecting the thread (25) on an extension (4, 14) on the spool (23) can be achieved. When the thread (23) is deflected on an extension (4, 14), threads that are attached in opposite directions to the coil winding on the extension (4, 14) can be used to provide a thread reserve which can be easily released and which can be pulled out as a whole or in sections.

Description

The invention relates to a method for forming a curl-free thread reserve and a winding machine for winding one or more threads.

On winding machines, twisting machines and specialist machines, the threads are "pulled off" from a delivery spool. The threads are passed through an eyelet arranged above the delivery spool. Between this guide eye and the bobbin surface, the thread runs in a balloon shape due to the centrifugal forces acting on the thread. The eyelet is installed at a distance from the surface of the coil based on experience and the space available.

When threading after a thread break or after changing the bobbin, the thread length required for the threading process is first subtracted from the bobbin. As soon as the pulling stops and the tension in the thread subsides, curls form in the spun threads, which can lead to unsolvable knots. Such knots cause discontinuities (e.g. thick spots) and can cause needle breaks in sewing machines. The thick spots must therefore be removed in an additional step if a perfect yarn is to be produced.

In the event of interruptions in work, ie whenever the running thread is not continuously removed from the delivery spool, or is pulled off and consequently no tension acts on the thread, parts of turns or entire turns come off the coil surface and form curls as a result of the twist originating from spinning or twisting. When starting again, the curls may not dissolve and be wound in. Knots can also form, which trigger a new interruption of the winding point or which can lead to an interruption in the further processing of the bobbin or the thread.

Various methods and devices are known which attempt to prevent curling.

One of these known devices consists of a velvet cushion, which is attached outside the thread balloon area. After removing the required thread reserve, the operator holds the end with one hand and with the other hand guides the thread coming from the bobbin onto the pillow and presses it there. No curls form between the spool and the pillow if the thread runs tangentially away from the spool. The thread length obtained in this way is very modest and detaches from the pillow with the slightest pull.

Clamping devices are already known which hold the thread. However, these devices cannot satisfy either because the operator must first open the clamping device to insert the thread and therefore needs both hands for the process.

From a recently published German Offenlegungsschrift No. 31 20 430, a device for preventing thread curls when yarn is running has become known. In this device, a bristle ring is inserted between the yarn drain or delivery spool and a yarn guide element, the elastic bristles of which protrude into the thread balloon and keep the running yarn taut.

This device is completely unusable for fine yarns and in particular on specialist machines, since no free balloon formation and therefore no clean drainage of the yarn from the bobbin surface is possible. Furthermore, automatic start-up of the machine is not possible without additional thread guiding means which keep the yarn out of engagement with the bristle ring.

The object of the present invention is now to prevent the formation of curls or the detachment of turns from the bobbin surface when the winding process is interrupted at the winding point.

In particular, the object of the invention is also to prevent the formation of curls on the unbroken thread or threads on specialist machines with a large number of threads running towards a take-up spool.

Another object is to provide a simple, one-handed process for forming a curl-free thread reserve in the event of thread breakage.

A further object of the invention is that both thread reserves of threads drawn off over the head and of threads drawn tangentially from rotating bobbins are possible.

Another object of the invention is to provide a device with which thread reserves can be built up without curling.

Another object of the invention is that the device keeps the thread free of curls even when work is interrupted.

These tasks are solved according to the characteristics of claims 1 and 8. Further advantageous embodiments are defined in the dependent claims.

The deflection of the thread section running from the delivery bobbin to the take-up bobbin at the upper edge of the delivery bobbin and the braking effect thus achieved prevent the thread effective it to move to the package surface back and there the one hand to form yarn curls and on the other hand wegzu in all turns of the coil surface conduct ^g. By reducing the distance between the guide eyelet and the top edge of the bobbin or reducing the thread running angle cx to the end face of the bobbin, the friction of the thread on the edge can be increased to such an extent that the thread can no longer slide back to the bobbin surface.

Another advantage of the invention is that the movement of the eyelet and / or the spool can be carried out with little technical effort.

A thread reserve can easily be removed by hand even when the distance between the eyelet and the bobbin is reduced.

A thread reserve that is placed by hand around the extension and secured by the friction on the edge can be produced on new and existing machines with very little effort.

Another advantage of the invention is that the thread reserve can be released onto the thread with a low tensile force.

Another advantage of the invention is that the thread reserve can be used for threads drawn off overhead as well as for tangentially drawn threads.

Another advantage of the invention is that the thread reserve can be formed on the bobbin tube itself. Another advantage of the invention is that the thread reserve can be formed on the spool pin. Another advantage of the invention is that no elements that interfere with the handling of the machine have to be provided in the area of the thread path.

Another advantage of the invention is that the thread reserve can be released in several steps.

Another advantage of the invention is that both right- as well as left-wound or wound threads can be placed in reserve.

Another advantage of the invention is that if one of the threads breaks when the thread or threads are broken, they can also be placed in a reserve loop and therefore do not have to be reattached.

• Fig. la eine Ansicht einer auf einen Dorn aufgesteckten Spule mit Fadenabzug über Kopf,
• Fig. lb eine Aufsicht auf das Dornende von Fig. la,
• Fig. 2a eine Aufsicht auf das Dornende von Fig. 2b,
• Fig. 2b,3,4 ein Dornende,
• Fig. 5 eine Ansicht einer auf einen Dorn aufgesteckten Spule mit tangentialem Fadenabzug,
• Fig. 6 eine schematische Darstellung einer Spulstelle mit verschiebbarer Führungsöse,
• Fig. 7 eine schematische Darstellung einer Spulstelle mit verschiebbarer Aufsteckung,
• Fig. 8 eine Ansicht einer Spulstelle mit vier horizontal liegenden Spulen und
• Fig. 9 eine Seitenansicht von Figur 3.

The invention is explained in more detail on the basis of illustrated exemplary embodiments. Show it:

• La is a view of a spool plugged onto a mandrel with thread take-off overhead,
• Fig. Lb is a plan view of the mandrel end of Fig. La,
• 2a is a plan view of the mandrel end of Fig. 2b,
• 2b, 3.4 a mandrel end,
• 5 is a view of a spool with tangential thread draw-off, which is plugged onto a mandrel,
• 6 is a schematic representation of a winding unit with a sliding guide eye,
• 7 shows a schematic illustration of a winding unit with a displaceable attachment,
• Fig. 8 is a view of a winding unit with four horizontally lying bobbins and
• 9 is a side view of FIG. 3.

A coil 1 is placed on a mandrel, not visible in the figure, which engages in the sleeve 2 of the coil 1, and is held in this in a rotationally fixed manner (Fig.la.). A large number of turns lie on the coil 1, but only three of them are shown individually with the reference symbols a, b, c. Together they form the thread 3.

An extension 4 with a cranked end piece 5 protrudes from the upper end (head) of the coil 1 or the sleeve 2 (FIG. 1b). Instead of the end piece 5, a slotted disc 6 can also be provided (FIGS. 2a, 2b), or the extension 4 may have a gooseneck 7 (FIG. 3).

Instead of the extension 4, the coil sleeve 2 itself can be extended by a few centimeters (FIG. 4) and have an end piece 8 at the top similar to the end piece 6 in FIG. 2a. In all embodiments, a conical section 13 can be provided at the root of the extension 4 (Fig.la).

The surface of the extension 4 is preferably polished so that the thread 9 cannot be damaged when pulled off and slides with the least resistance.

• Das an die letzte Windung c anschliessende Fadenende 9,z.B. 2o cm, wird ein- oder mehrmals um den Fortsatz 4 gewunden und nach oben in Richtung des Pfeiles A geführt. Die nun kringelsicher an der Oberkante 10 umgelenkte, auf der Oberfläche der Spule 1 haftend liegende, leicht aufzulösende Fadenreserve setzt sich im dargestellten Beispiel in Fig. 1 aus den Längen der zwei Windungen b und c auf der Spule 1 sowie den Längen der zwei Windungen d und e auf dem Fortsatz 4 zusammen.

To create a thread reserve, proceed as follows:

• The thread end 9 adjoining the last turn c, for example 20 cm, is wound one or more times around the extension 4 and guided upwards in the direction of the arrow A. The thread reserve now deflected securely at the upper edge 10, adhering to the surface of the bobbin 1 and easily detachable, in the example shown in FIG. 1 is composed of the lengths of the two turns b and c on the bobbin 1 and the lengths of the two turns d and e on the extension 4 together.

When the thread reserve is pulled off or released by pulling on the thread end 9, the thread loop B slides along this edge lo, braked by friction at the edge lo. The end piece 5 prevents the thread 9 or the windings e and d from sliding out of the extension 4 at the top before they are released.

With each full handling of the loop B on the edge lo, one turn on the coil 1 and on the extension 4 dissolve. If all the turns d and e on the extension 4 are dissolved, the thread 9 slides automatically out of the end piece 5, from which it was previously held back, and merges into the balloon-shaped course C.

The length of the thread reserve therefore depends on two factors. on the one hand on the number of turns on the extension 4 and on the current diameter of the coil 1, which determines the length of the turns a, b, c.

As long as a loop B or a turn is present on the extension 4, the thread tension at the thread end 9 can drop at any time without a curl occurring in the reserve on the surface of the bobbin 1.

5 shows a thread 13 drawn off tangentially from a bobbin 11. Two turns d 'and e' are placed on an extension 14. The thread loop B of the thread end 19 slides on the upper edge 2o, which leads to the turns a ', b', c '. The tangential withdrawal of the thread 19 makes it unnecessary to attach an end piece to the extension 14.

When the thread reserve is withdrawn or released, one turn on the bobbin is released per turn on the extension.

The extensions 4, 14 can be an extension of the arbor, but they can also be inserted as independent elements in the coil sleeve 2, 12.

The only condition for a trouble-free withdrawal of the thread 3 is that the extension 4 with the end pieces 5, 6, 7 or 8 lies within the thread balloon C. 5, in which coil 11 rotates during operation, the formation of the extension 14 plays a subordinate role.

In Figures 6 and 7, the details of the winding units are only shown to the extent necessary to understand the invention. In particular, all drive and control elements as well as the supporting structure and the adjacent winding units have been omitted.

In a vertical position, a delivery spool 23 is attached to a slip gate 21 with a slip pin 22. The gate 21 can be fixedly connected to a supporting structure or can be pivotally or rotatably fastened thereon. A guide eyelet 24 is located coaxially to the mandrel 22 at a distance ho from the coil 23. A lead from the coil passes through the eyelet 24 23 withdrawn thread 25 to a take-up spool 26, which can be driven, for example, by a friction roller 27. A laying device (not shown) guides the thread 25 back and forth along the bobbin 26, forming intersecting turns. The rectangle 28 shown in broken line represents the thread monitoring, the thread separating and splicing device as well as for an automatic thread attachment device that may be present.

Between the bobbin 23 and the eyelet 24, the thread 25 forms a revolving balloon 29 when it is pulled off. The thread consequently runs directly from the bobbin surface to the eyelet 24 without touching the edge 211 of the bobbin 23.

In FIG. 6, the eyelet 24 is attached to an arm 210 and can be pivoted with it from the working position into a rest position (dashed lines). In the rest position, the distance h _o from the eyelet 24 to the coil 23 is reduced to a fraction of the original value.

At a reduced distance h _1, the thread 25 then forms an angle α <60 ° with the end face 213 of the bobbin and is deflected or braked by the upper edge of the bobbin 23. The angle α of the thread 25 is preferably 45 ° ± lo °.

In FIG. 7, the deflection of the thread 25, or the reduction of the distance h to a value h _1, is achieved in that the slip gate 21 or the slip pin 22 is arranged to be axially displaceable against the guide eye 24.

The pivoting of the arm 210, or the displacement of the arbor 22 can be done mechanically or pneumatically. The choice of drive system will depend on the type of drive already available on the machine.

Of course, the arbor 22 and the eyelet 24 can also on an inclined to the vertical axis or be provided horizontally.

FIGS. 8 and 9 show horizontal coil attachments using the example of a specialist machine with four delivery coils.

If a thread breaks during operation or a winding point is shut down, the machine control, for example after receiving a signal from the thread monitoring, causes the arm 210 to pivot and / or the winding mandrel 22 to be displaced, so that the distance between the eyelet 24 and the bobbin 23 increases reduced to the amount h ₁ and the thread 25 thereby deflected at the edge 211 of the bobbin 23 and thus the friction at the edge 211 is increased. As a result of this friction of the thread 25 on the edge 211, the thread turns 212 lying above can no longer detach from the bobbin 23. The formation of curls both on the spool surface and in the rest of the thread path is thus excluded.

At high take-off speed, the tension in the thread with the eyelet 24 lowered or the spool 23 raised would reach a value at which the thread breaks.

If the eyelet 24 is lowered or the angle d is reduced when the thread is unbroken, the speed at which the distance h _o between the eyelet 24 and the bobbin 23 is reduced must be adapted to the respective thread take-off speed.

vergrössert werden.The situation is similar when the machine is restarted. As the thread take-off speed increases, the distance h

be enlarged.

Regardless of the distance h ₁ between the eyelet 4 and the bobbin 23, however, the length of the thread required for attachment in the event of thread breakage can be subtracted from the bobbin 23 by hand to overcome the friction and, for example, be pulled in again after the thread breaks.

If an extension 4 is provided above the bobbin 23, which lies outside the bobbin axis, then an end piece which prevents the axial escape of the thread 25 can be dispensed with if the end of the extension 4 and the eyelet 24 are brought to the same level after a thread break will,

Claims (22)

1. A method for forming a thread reserve and for preventing thread coils in the thread reserve between a delivery spool and a take-up spool when starting work breaks and when a thread breakage of a thread to be removed from the supply spool while forming a balloon on winding machines, specialist machines and the like, characterized in that the thread (3,25) between an eyelet (24) delimiting the balloon (29) above the bobbin (1,23) and the bobbin surface on the upper edge (10,20,211) of the bobbin (1,23) is deflected such that the thread (3, 25) due to the friction on the upper edge (10, 20, 211) when the thread tension slackens no longer detaches from the surface of the bobbin (1,23). 2. The method according to claim 1, characterized in that when the thread breaks and when the work is interrupted, the distance h between the eyelet (24) and the bobbin (1,23) is reduced until the thread (3,25) between the upper edge (10, 20 _; 211) and the eyelet (24) includes an angle α <60 ° to the end face of the coil (213). 3. The method according to claim 2, characterized in that the thread (3,25) extends at an angle α of 45 ° ± 10 °. 4. A method for forming a curl-free thread reserve when pulling in the thread according to claim 1, characterized in that with the end (9, 19) of the thread (3, 13, 25) one for the winding course on the bobbin (1, 11, 23) Reverse winding (d, d ') forming an loop (B) on the upper edge (10.20.211) of the coil (1, 11, 23) on an axial extension (4, 14) of the coil (1, 11, 23 ) is placed. 5. The method according to claim 4, characterized in that the loop (B) is braked sliding along the bobbin edge (10,20,211) when pulling out the thread reserve. 6. The method according to claim 4, characterized in that the thread end (9, 19) is prevented when the thread reserve is released from sliding axially over the end of the extension (4, 14). 7. The method according to claim 4, characterized in that the thread end (9) is prevented by the eyelet (24) from sliding over the end of the extension (4). 8. winding machine and the like with a plug-on mandrel for plugging on a delivery spool, a driven spool for winding up one or more threads running towards the spool and a guide eyelet which is arranged essentially coaxially to the plug-on mandrel, characterized in that means for reducing the angle of the between the eyelet (24) and the bobbin (1,23) running thread (3,13,25) are provided. 9. Winding machine according to claim 8, characterized in that the eyelet (24) is lowered to reduce the angle α in the direction of the coil (23). 10.Dispenser according to claim 8, characterized in that the delivery spool (23) is raised to reduce the angle α in the direction of the eyelet (24). 11. winding machine according to one of claims 8,9,10, characterized in that the distance h ₁ between the eyelet (24) and the coil (23) is reduced until the angle α is less than 60 ⁰ . l2.Swinder according to claim 10, characterized in that the eyelet (24) is arranged on an arm (210) pivotable in the direction of the spool (23). 13.Winder according to one of claims 9 or 10, characterized in that the arm (210) and / or the mandrel (22) is connected to a drive member for pivoting the arm (210) or for lifting the mandrel (22). 14.Dispenser according to claim 8, characterized in that on the sleeve (2,12) of the bobbin (1,11,23) an extension (4.14) designed axially is attached to which the thread (3.13 , 25) can be deflected such that the angle (is less than 60 °. l5.Swinder according to claim 14, characterized in that the extension (4, 14) is part of the mandrel carrying the sleeve (2, 12). 16. winding machine according to claim 14, characterized in that the extension (4, 14) is inserted into the sleeve (2, 12). 17. winding machine according to claim 14, characterized in that the extension (4, 14) is designed as an extension of the sleeve (2, 12). 18. Winding machine according to one of claims 14, 15, 16, 17, characterized in that an end piece (5, 6, 7, 7, 3, 13, 25) guiding the thread (9, 19 or 3, 13, 25) on the extension (4, 14) , 8) is provided. 19.Dispenser according to claim 18, characterized in that the end piece (5,6,7,8) prevents the thread end (9,19) or the thread (3,13,25) when leaving the extension (4), to slide around the end of the extension (4). 20.Dispenser according to one of claims 18 and 19, characterized in that the end piece is a cranked part (5) of the extension (4, 14) or a slotted disc (6) attached to the extension (4, 14) or the gooseneck-shaped End (7) of the extension (4, 14) or a piece of wire (8) fastened on the extension (4, 14). 21. Spooling machine according to claim 14, characterized in that the extension (4, 14) has a conically tapering section following the end face of the spool (13).

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