DE2908731B1

DE2908731B1 - Device for suctioning the thread end from a bobbin in winding machines

Info

Publication number: DE2908731B1
Application number: DE19792908731
Authority: DE
Inventors: Kresimir Dipl-Ing Mista
Original assignee: MAYER FA KARL; Karl Mayer Textilmaschinenfabrik GmbH
Current assignee: MAYER FA KARL; Karl Mayer Textilmaschinenfabrik GmbH
Priority date: 1979-03-06
Filing date: 1979-03-06
Publication date: 1980-07-10

Description

Empfehlenswert ist es ferner, wenn in der Stirnfläche etwa in Höhenrichtung verlaufende Nuten mit Abstand voneinander angeordnet sind. Diese Nuten definieren Saugkanäle mit vorgegebenem Querschnitt, in welchen auch dann noch Unterdruck-Kräfte wirksam sind, wenn der Spalt zwischen dem Rest der Stirnfläche und der Spule praktisch geschlossen ist. Darüber hinaus ist in diesen Nuten eine sehr hohe Luftgeschwindigkeit vorhanden, so daß die Fadenenden mit Sicherheit ergriffen und in den Saugschlitz gezogen werden. It is also recommended if in the end face approximately in the vertical direction Grooves running at a distance are arranged from each other. These Grooves define suction channels with a predetermined cross-section, in which they will then still be Negative pressure forces are effective when the gap is between the rest of the end face and the coil is practically closed. In addition, there is one in these grooves very high air speed available, so that the thread ends are gripped with certainty and pulled into the suction slot.

Vorzugsweise ist die Lippe zwischen zwei mit dem Saugschlitz verbundenen, in Verschieberichtung verlaufenden Führungsflächen gehalten, die sich zumindest auf der Unterdruckseite bis nahe an die Stirnfläche erstrecken. Bei einer solchen Führung ist die Klemmgefahr am geringsten, weil beim Auftreten von Querkraftkomponenten nur kleine Hebelarme zu berücksichtigen sind. Preferably, the lip is between two connected to the suction slot, held in the direction of displacement guide surfaces that are at least extend on the negative pressure side up to close to the end face. With such a Guidance, the risk of pinching is lowest, because when lateral force components occur only small lever arms need to be taken into account.

Darüber hinaus sollten die Führungsflächen Teile eines bis auf den Austrittschlitz für die Lippe geschlossenen Gehäuses sein. Damit ist die Gefahr beseitigt, daß die Führungsflächen durch Flusen u. dgl. In addition, the guide surfaces should be parts of a down to the Be the exit slot for the lip of the closed housing. With that there is the danger eliminates that the guide surfaces by lint and the like.

verschmutzen und die Lippe in ihrer leichten Bewegbarkeit behindert ist.soiling and hindering the lip from moving easily is.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigt F i g. 1 die erfindungsgemäße Vorrichtung in räumlicher Darstellung, F i g. 2 einen Querschnitt durch die erfindungsgemäße Vorrichtung und Fig.3 eine Ansicht einer abgewandelten Ausführungsform der Lippe schräg von vorn. The invention is illustrated below with reference to one in the drawing Embodiment explained in more detail. It shows F i g. 1 the device according to the invention in three-dimensional representation, FIG. 2 shows a cross section through the inventive The device and FIG. 3 shows a view of a modified embodiment of the lip diagonally from the front.

Eine Kreuzspule 1 wird von einer Leit- oder Fadenführungstrommel 2 angetrieben. Die zugehörigen Lager und Antriebselemente sind nicht veranschaulicht. A cheese 1 is from a guide or thread guide drum 2 powered. The associated bearings and drive elements are not illustrated.

Die Kreuzspule 1 weist eine Hülse 3 auf, welche mit einem Fadenwickel 4 versehen wird. Reißt während des Bewickelns der Faden oder ist der zuliefernde Kops abgespult, so muß das Fadenende der Spule erfaßt und einer Knotvorrichtung zugeführt werden. Zu diesem Zweck wird die Spule 1 in umgekehrter Drehrichtung und mit geringerer Drehzahl angetrieben, wobei gleichzeitig in dem Spalt 5 zwischen Spule 1 und Trommel 2 ein Unterdruck erzeugt wird, Zu diesem Zweck ist ein Saugrohr 6 vorgesehen, das ein flaches Mündungsstück 7 mit einem Saugschlitz 8 aufweist, der sich über die gesamte axiale Länge der Spule 1 erstreckt. Die Unterseite dieses Schlitzes befindet sich dicht über der Oberfläche der Trommel 2.The cheese 1 has a sleeve 3, which with a thread lap 4 is provided. Does the thread break during winding or is the one delivering Kops unwound, the thread end of the bobbin must be grasped and a knotting device are fed. For this purpose, the coil 1 is in reverse direction of rotation and driven at a lower speed, while at the same time in the gap 5 between Coil 1 and drum 2 a negative pressure is generated, for this purpose there is a suction pipe 6 is provided, which has a flat mouth piece 7 with a suction slot 8, which extends over the entire axial length of the coil 1. The bottom of this The slot is located just above the surface of the drum 2.

An der Oberseite des Mündungsstücks 7 befindet sich ein Führungsgehäuse 9 mit einer oberen Führungsfläche 10 und einer unteren Führungsfläche 11. Zwischen den beiden Führungsflächen ist eine Lippe 12 verschiebbar gelagert. Die Lippe kann, wie es F i g. 1 zeigt, durch eine Rückholfeder 13 belastet sein. A guide housing is located on the top of the mouthpiece 7 9 with an upper guide surface 10 and a lower guide surface 11. Between A lip 12 is mounted displaceably on the two guide surfaces. The lip can as it F i g. 1 shows to be loaded by a return spring 13.

Die Stirnseite 14 der Lippe hat eine Höhe von 10 mm und verläuft senkrecht zu der durch die Führungsflächen 10 und 11 vorgegebenen Verschieberichtung. Die Stirnfläche ist eben und weist nur am Rand eine Rundung 15 auf. Aufgrund der Spiegelsymmetrie in Höhenrichtung ist auch eine Rundung 16 am unteren Rand vorgesehen. Infolge diese Ausbildung wird im Saugbetrieb zwischen Stirnfläche 14 und Spule 1 ein Unterdruck erzeugt, der infolge der eingezeichneten Nebenluftströmung um so größer ist, je kleiner der Nebenluftspalt 17 zwischen Lippe 12 und Spule 1 ist. The end face 14 of the lip has a height of 10 mm and runs perpendicular to the direction of displacement predetermined by the guide surfaces 10 and 11. The end face is flat and has a rounding 15 only at the edge. Due to the Mirror symmetry in the vertical direction is also provided with a rounding 16 on the lower edge. As a result of this design, in suction mode between the end face 14 and the coil 1 a negative pressure is generated, which as a result of the secondary air flow drawn in is larger, the smaller the secondary air gap 17 between lip 12 and coil 1 is.

Erst wenn die Stirnfläche 14 bzw. die Rundung 15 dicht an der Spule 1 anliegt und damit den Spalt 17 vollständig abdichtet, sinkt die Unterdruck-Kraft, da dann nur noch der statische Unterdruck im Walzenspalt 5 wirksam ist.Only when the end face 14 or the rounding 15 is close to the coil 1 is applied and thus completely seals the gap 17, the vacuum force decreases, since then only the static negative pressure in the nip 5 is effective.

Damit dieser statische Unterdruck keine zu großen Querkraftkomponenten auf die Lippe 12 erzeugen kann, ist die untere Führungsfläche 11 weiter zum Walzenspalt hin geführt als die obere Führungsfläche 10. Auf diese Weise ergibt sich auch eine Anpassung der Führungsflächen an den Verlauf des Umfangs der Spule 1.So that this static negative pressure does not have too large lateral force components can produce on the lip 12, the lower guide surface 11 is further to the nip out as the upper guide surface 10. This also results in a Adaptation of the guide surfaces to the course of the circumference of the coil 1.

Fig. 3 zeigt eine Abwandlung, bei der die Lippe 12 an der Stirnfläche 14 zusätzlich mit in Höhenrichtung verlaufenden Nuten 18 versehen ist, die einen definierten Durchtrittsquerschnitt für die Nebenluft darstellen, wenn die Lippe 12 relativ dicht an der Spule 1 anliegt. Zumindest am Grund dieser Nuten ergibt sich dann eine ausreichende Saugkraft. Darüber hinaus ist die Störmungsgeschwindigkeit in den Nuten so hoch, daß das Fadenende mit größerer Sicherheit erfaßt wird. Fig. 3 shows a modification in which the lip 12 on the end face 14 is additionally provided with grooves 18 extending in the height direction, the one represent defined passage cross-section for the secondary air if the lip 12 rests relatively close to the coil 1. At least at the bottom of these grooves then sufficient suction power. In addition, the rate of failure so high in the grooves that the thread end is gripped with greater certainty.

Insgesamt läßt sich damit ein Betrieb erzielen, bei dem die Lippe die Spule gerade noch, aber weitgehend kraftlos berührt, bei dem die Nebenluftmenge sehr gering, der Luftverbrauch also reduziert ist und bei dem eine erhöhte Saugleistung auftritt. Overall, an operation can be achieved in which the lip the coil just touches, but largely powerless, in which the secondary air volume very low, so the air consumption is reduced and with an increased suction power occurs.

Claims

Claims: 1. Device for sucking the thread end from a Bobbin in winding machines, with a suction slot that extends over the entire axial Extends length of the coil and is covered on one side by a lip, which in the direction is displaceable on the spool, characterized in that the lip (12) has a End face (14) has such a size that it is due to the suction between End face (14) and coil (1) occurring negative pressure in the direction of the coil is movable.

2. Apparatus according to claim l, characterized in that the lip (12) is loaded by a return spring (13).

3. Apparatus according to claim 1 or 2, characterized in that the end face (14) has a height of at least 4 mm.

4. Apparatus according to claim 3, characterized in that the end face (14) has a height of 10 to 12 mm.

5. Device according to one of claims 1 to 4, characterized in that that the end face (14) is essentially perpendicular to the direction of displacement.

6. Device according to one of claims I to 5, characterized in that that the end face (14) is approximately mirror-symmetrical to the half-height Center line is.

7. Apparatus according to claim 5 or 6, characterized in that the end face (14) is flat and only rounded at the edge.

8. Device according to one of claims 1 to 7, characterized in that that in the end face (14) extending grooves (18) approximately in the vertical direction at a distance are arranged from each other.

9. Device according to one of claims 1 to 8, characterized in that that the lip (12) between two connected to the suction slot (8) in the direction of displacement extending guide surfaces (10, 11) is held, which are at least on the negative pressure side extend to close to the end face (14).

10. Apparatus according to claim 9, characterized in that the Guide surfaces (10, 11) parts of one except for the exit slot for the lip (12) are closed housing (9).

The invention relates to a device for sucking off the End of thread from a bobbin in winding machines, with a suction slot that extends over it extends the entire axial length of the coil and covered on one side by a lip which is displaceable in the direction of the spool.

In a known device of this type (DE-PS 1560367) is the The lip of the bobbin holder can be controlled via a linkage so that the end of the thread is captured and can be fed to a knotting device if the thread of the bobbin is broken or the cop to be delivered has been unwound. This is to ensure that the lip always a defined small distance from the coil, so that not as a result of permanent Constant wear occurs on contact, but on the other hand during suction operation As little secondary air as possible is sucked in.

The linkage between the bobbin holder and lip requires a considerable amount additional effort.

In addition, it is practically impossible to use the remaining secondary air gap to keep constant with changing diameters of the coil, since this gap does not change linearly with the spool diameter. Are accordingly different also the secondary air losses.

The invention is based on the object of providing a device of the initially described type described, which has a much simpler structure and makes it possible to to keep the secondary air to be accepted low regardless of the coil diameter.

This object is achieved according to the invention in that the lip has an end face of such a size that it is due to the suction between Front surface and coil occurring negative pressure can be displaced in the direction of the coil is.

With this construction, special drive devices are not required for the lip. Nevertheless, regardless of the coil diameter, the lip is always in close proximity to the outside of the bobbin, be it with a very small distance, be it practically without force.

Self-regulation takes place here. Because the one on the face Acting negative pressure forces become larger, the smaller the gap becomes, they go but back to zero when the gap closes.

As a result, there is a gap between the lip and the coil, which is just not completely closed. There is a balance between the negative pressure forces and the supporting forces acting on the lip.

In the simplest case, these result from the fact that the end face lightly rests against the outside of the bobbin, but still a certain amount Secondary air passage is possible due to the non-flat winding surface.

In many cases it is convenient to have a return spring on the lip to charge. This ensures that the lip each time the suction operation has ended returns to its rest position. In addition, it creates a supporting force that it allows for the smallest gap without direct contact with the bobbin to work.

While so far the lip was let out in a narrow edge, it is now of interest to give the end face a sufficient size. Therefore, the end face should have a height of at least 4 mm, preferably of 10 to 12 mm, whereby the value can be smaller, the greater the negative pressure.

It is also advantageous if the end face is essentially perpendicular to the direction of displacement. It is then avoided that the vacuum force a essential component generated transversely to the direction of displacement through which the lip could get jammed in their leadership.

The same advantage can also be achieved if the face is about is mirror symmetrical to the halfway center line. Possible Occurring transverse components of the force cancel each other out.

In a preferred embodiment, the end face is flat and only rounded at the edge This results in a large negative pressure area. Still exists no risk of the winding or the sucked thread being damaged by sharp edges will.