Textiles: spinning – twisting – and twining – Apparatus and processes – Elements
Reexamination Certificate
2000-06-28
2002-04-09
Falik, Andy (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Elements
C057S092000, C057S132000, C057S135000, C057S406000, C384S228000
Reexamination Certificate
active
06367237
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a play-free and centering tube of a textile machine. Couplings of this type consist of at least three driving elements which are arranged in a tube receptacle connected nonpositively to the spindle shank, the tube coupling being supported centrically type are required in the textile industry, preferably in spinning and twisting mills.
2. Discussion of Background Information
Tube couplings of the generic type have already been developed. Thus, DE 41 31 498 A1 describes the tube coupling for a spinning or twisting spindle, in which movable driving bodies are used, which are pressed against the inner face of the tube as a result of the centrifugal force. They make a nonpositive and/or positive-connection there between the spindle upper part and the tube and thus make it possible to transmit a torque. On account of the low masses of the movable parts, the available centrifugal forces are relatively low, and therefore a reliable drive of the tubes on the spindle upper parts cannot be ensured. Moreover, at low rotational speeds of the spindles, the coupling has an insignificant effect, so that, particularly when the spindle is being braked, the tube slips on the spindle upper part. This has an adverse affect both on the yarn quality and on the wear of the tube.
Furthermore, DE 42 17 381 A1 describes a tube coupling which is likewise designed as a centrifugal coupling. This centrifugal coupling is located in an extension of the drive wharve, and, because of the relatively low driving forces, a sleeve having a profiled inner face is provided. In this solution, the driving action is reinforced in that there is only a very slight dimensional play between the outside diameter of the tube coupling and the inside diameter of the tube.
DE 43 18 027 A1 discloses a tube coupling intended for making a nonpositive connection between the tube and the spindle upper part by means of variously designed driving bodies. Due to the centrifugal forces which arise, the driving bodies are set in wobbling motion, with the result that they are clamped between the spindle upper part; and the tube. The disadvantage of this type of tube coupling is that the tube is not reliably driven centrically to the spindle axis. Another disadvantage is that this nonpositive clamping connection does not come loose easily when the spindle is at a standstill. Furthermore, it may happen that the driving bodies themselves do not assume a centric position to the spindle axis, this being conducive to the development of unbalances. Moreover, the stability of the spindle upper part is weakened due to the receiving bores for the driving bodies.
Finally, DE 195 37 762 A1 describes a technical solution which is to be suitable particularly for spinning tubes with lower yam masses. In this case, considerable acceleration for starting up the spindle is necessary in order to rotate the rotatable ring in the ball guide. This solution is not suitable for bridging pronounced dimensional differences between the tube inside diameter and the outside diameter of the tube coupling. Since the driving bodies fall down as a result of their inherent mass when the spindle is at a standstill, cantering of the tube can no longer be ensured.
The known technical solutions have in common the defect that they do not offer a sufficient safeguard for reliable centering of the bobbin tube relative to the spindle axis and for the simple removal of the wound tubes from the spindle upper parts. As is known, draw-twist tubes are deformed as a result of the winding forces in such a way that, if there is insufficient play between the inside diameter of the tube and the outside diameter of the tube coupling, the firm fit regularly presents problems when the tube is drawn off.
SUMMARY OF THE INVENTION
The object of the invention, therefore, is to overcome the defects of the known prior art and to provide a tube coupling for spinning or twisting spindles which ensures unimpeded functioning even when there are pronounced dimensional differences between the inside diameter of the tube used and the outside diameter of the tube coupling.
Moreover, the technical solution is to ensure that a possible deformation of the tube when the latter is being wound with thread material is riot detrimental to the centric position of the tube to the spindle axis and the reliable drive of the tube by the spindle. It is to become possible, furthermore, to ensure that tube deformation, which is usually to be seen when plastics are used as tube material and because of high thread forces, does not lead to the firm fit of the tube on the spindle when the latter is at a standstill, so that the draw-off of the tube by hand or by means of tube draw-off devices can easily be ensured. The technical solution to be provided will also be distinguished by a simple design and easy assembly.
According to the invention, a play-free and centering tube coupling for the spindle of a textile machine, includes of at least three driving elements which are arranged centrically so as to bear against an inner wall of the tube, in a tube receptacle connected nonpositively to the spindle shank. A basic body of a thrust piece is axially moveably arranged in the tube receptacle and an end piece fixedly connected to the basic body. The driving elements are arranged so as to be movable predominantly radially between the basis basic body and the thrust piece, and guide slopes, which are in contact with the driving elements and are in the form of a conically designed collar are arranged on the thrust piece. Detaining centrifugal elements, which are displaceable predominantly radially, are arranged between the thrust piece and the end piece, and at least one of the faces of the thrust piece and of the end piece, which are in contact with the detaining centrifugal elements, is designed as a guide slope.
According to the aforementioned invention a play-free and centering tube coupling for the spindle of a textile machine includes at least three driving elements which are arranged centrically in a tube receptacle and come to bear nonpositively on the inner wall of the tube. For this purpose, the tube receptacle includes a basic body, of a thrust piece arranged axially movably therein and of an end piece fixedly connected to the basic body. The driving elements are arranged between the basic body and the thrust piece and are designed to be movable predominantly radially. Arranged on the thrust piece is a conically designed collar, of which the parts which are in contact with the driving elements function as guide slopes. Moreover, detaining centrifugal elements displaceable predominantly radially are arranged between the thrust piece and the end piece. Finally, the fundamental design of the tube coupling includes the fact that at least one of the faces of the thrust piece and of the end piece which are in contact with the detaining centrifugal elements is designed as a guide slope. The entire tube coupling therefore consists solely of simple components which can be produced and assembled efficiently. In particular, it fulfills the aim of ensuring that, if required, even those bobbin tubes can be received which are subject to deformations as a result of high thread forces and, if tube couplings known hitherto are used, may cause complications in the necessary removal from the spindle upper part.
By contrast, with the newly developed tube coupling, any desired geometric plays between the outer circumference of the tube coupling and the inside diameter of the nonloaded tube can be selected, so that not only can the manufacture of the tube coupling be carried out in a virtually completely mechanized and automated manner, but the requisite fault-free mechanized or manual attachment and removal of the tubes on the respective textile machine can also take place.
Furthermore, the particular advantage of the proposed tube coupling is that, even when the respective spindle is at a standstill, the tube is centered relative to the spindle axis and, consequen
Falik Andy
Greenblum & Bernstein P.L.C.
Spindelfabrik Neudorf GmbH
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