Title of Invention	A BOBBIN TUBE SUPPORT FOR SPINNING OR TWISTING SPINDLES
Abstract	This invention relates to a bobbin tube support for spinning or twisting spindles, the support being capable of taking along and exact centering of the bobbin tube on the spindle upper part by means of a multipoint support, characterized in that the multipoint support (5, 6, 7) has positive fit.

Full Text

FIELD OF THE INVENTION The present invention relates to a bobbin tube support for spinning or twisting spindles, in which support the taking along and the centering of the bobbin tube on the spindle upper part is achieved by means of a multipoint support and without the application of additional movable coupling elements. BACKGROUND OF THE INVENTION It is known that the bobbin tube is centered by means of spring-mounted elements and, at the same time, taken along. It is further known that the centering and taking along of the bobbin tube can be effected by coupling members under the action of centrifugal forces. The coupling of the bobbin tube and the spindle by means of conically shaped bearing surfaces is also known. The above mentioned solutions have the disadvantage in that the exact centering of the bobbin tube is not guaranteed, as the bobbin tube is disposed, due to unbalance and the effect of the centrifugal forces, to one side of the spindle. Because of this off-center seat, the unbalance forces of the spindle bearing are increased. A bobbin tube support of the above mentioned type for avoiding the above mentioned disadvantages is known from German Democratic Republic published patent 102 169. Here the bobbin tube is centered, without play, on the spindle upper part and made fast by means of a multipoint support, whereby the bobbin tube is slightly deformed in the area of this multipoint support when placed onto the upper spindle part. Thus a frictional line contact is established between the bobbin tube and the spindle upper part. The disadvantages of the known bobbin tube support is the fact that as a result of diametrical tolerances of the bobbin tube, a slip-free friction connection of the bobbin tube support is no longer guaranteed. OBJECT OF THE INVENTION It is an object of the present invention, while retaining the advantages of the above mentioned bobbin tube support, to eliminate the disadvantageous influence of the diametrical tolerances. SUMMARY OF THE INVENTION This object of the present invention has been achieved in that the multipoint support has a positive fit. Due to the positive fit between the bobbin tube and the spindle upper part, the dependence on the slight deformation of the bobbin tube in the area of the multipoint support is eliminated, so that diametrical tolerances are no longer of any importance. In an embodiment of the present invention, the spindle upper part of the multipoint support in cross section - is designed as an equilateral polygon, to which corresponding cams on the inner circumference of the bobbin tube are arranged. At least three polygon surfaces must be present. When the vertical centre lines of the individual polygon surfaces intersect with the spindle axis, the bobbin tube is exactly centered in relation to the spindle. Under these circumstances, for example, an equilateral triangle is possible. When the bobbin tube is placed on the spindle upper part, the bobbin tube falls into a defined position. Insertion bevellings are advantageously provided on the spindle upper part. In order that the bobbin tubes do not have to turn too far until the cams are disposed on the individual polygon surfaces when the spindle starts to run, in practical embodiments at least six polygonal surfaces are provided on the spindle upper part. The number of cams should, however, be limited to three, so that, with regard to the arrangement of the cams on the respective polygonal surfaces, there is no overdetermination which could lead to friction. The number of polygonal surfaces must be divisible by three. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS These and further objects, features and advantages of the present invention will become more readily apparent from the following detailed description thereof when taken in conjunction with the accompanying drawings wherein: Figure 1 is a greatly enlarged top view of a bobbin tube support according to the present invention, Figure 2 is a perspective depiction of a spindle upper part in the area of the bobbin tube support. DETAILED DESCRIPTION OF THE INVENTION The bobbin tube support shown in Figures 1 and 2 between a spinning or a twisting spindle 1 and a bobbin tube 2 onto which yarn is wound is located in the upper area 4 of a spindle upper part 3. In the case of this bobbin tube support, the taking along and the centering of the bobbin tube 2 on the spindle upper part 3 takes place without the application of additional movable coupling elements. For the coupling of the bobbin tube 2 to the spindle upper part 3, a multipoint support, 5, 6 and 7 is provided, in the present case a three-point support. While the spindle upper part 3 below the bobbin tube support is, in the known way, cylindrical or slightly conical in design, it is in the upper area 4 in cross section designed as a polygon 8 having, in this case, six polygon surfaces 9 altogether. The enveloping surface of the polygon 8 is, in diameter, slightly smaller than the inner circumference 13 of the bobbin tube 2. To ensure the symmetry and to achieve a good centering of the bobbin tube 2 in relation to the relevant axis of the spinning or twisting spindle 1, the polygon 8 is equilateral. The bobbin tube 2 has on its inner circumference 13 three cams 10, 11 and 12 altogether, of which one is arranged to a polygonal surface 9. In order to avoid overdetermination and thus friction, however, only three symmetrically arranged cams 10, 11 and 12 are provided, even though there are more than three polygonal surfaces 9 - in the present case six - present. An optimum centering is achieved when the vertical centre lines 15 to each polygonal surface 9 intersect at one point, namely on the axis of the spindle upper part 3. In order to facilitate the placing of the bobbin tube 2 on the spindle upper part 3, the spindle upper part 3 is provided with insertion bevellings 14. When the bobbin tube 2 is placed on the spindle upper part 3, the procedure is such that the bobbin tube 2 is let fall down the last 50 mm. This can be done in the case of either manual doffing or automatic doffing. When the spinning or twisting spindle 1 starts to run, the bobbin tube 2 turns until the cams 10,11 and 12 are disposed in the area of the bobbin tube support on the respective polygonal surfaces 9. Thereafter, this point of contact on all cams 10, 11 and 12 lies on a circle, whose centre point is the centre of the spinning or twisting spindle 1. Thus, the bobbin tube 2 is always exactly centered on the spindle upper part 3 and is, at the same time, taken along having positive fit. Due to the embodiment according to the present invention, the bobbin tube 2 cannot travel to an off-centre position because of unbalance forces or as a result of action of centrifugal forces. The bobbin tube 2 cannot wander from the axis of the spinning or twisting spindle 1. We Claim 1. A bobbin tube support for spinning or twisting spindles, the support being capable of taking along and exact centering of the bobbin tube on the spindle upper part by means of a multipoint support, characterized in that the multipoint support (5, 6, 7) has positive fit. 2. Bobbin tube support as claimed in claim 1, wherein the spindle upper part (3) in the area of the multipoint support (5, 6, 7) is designed in cross section as an equilateral polygon (8), to which corresponding cams (10, 11, 12) on the inner circumference (13) of the bobbin tube (2) are arranged. 3. Bobbin tube support as claimed in claims 1 or 2, wherein the multipoint support (5, 6, 7) is provided in the upper area (4) of the spindle upper part (3). 4. Bobbin tube support as claimed in claim 3, wherein the spindle upper part (3) is provided with insertion bevellings (14) for guiding the bobbin tube (2) to the multipoint support (5,6, 7). 5. Bobbin tube support as claimed in any of the claims 2 to 4, wherein three cams (10, 11, 12) are provided, independent of the number of polygon surfaces (9). 6. Bobbin tube for a bobbin tube support for spinning or twisting spindles, whereby the bobbin tube is taken along and centered on the spindle upper part by means of a multipoint support, characterized in that the inner circumference (13) of the bobbin tube (2) is provided with cams (10, 11, 12) for the multipoint support (5, 6, 7) having positive fit on the polygon surfaces (9) of the spindle upper part (3). DATED THIS 19th DAY OF MARCH 2002 This invention relates to a bobbin tube support for spinning or twisting spindles, the support being capable of taking along and exact centering of the bobbin tube on the spindle upper part by means of a multipoint support, characterized in that the multipoint support (5, 6, 7) has positive fit.

Documents:

153-CAL-2002-(19-03-2012)-CORRESPONDENCE.pdf

153-CAL-2002-FORM-27.pdf

153-cal-2002-granted-abstract.pdf

153-cal-2002-granted-assignment.pdf

153-cal-2002-granted-claims.pdf

153-cal-2002-granted-correspondence.pdf

153-cal-2002-granted-description (complete).pdf

153-cal-2002-granted-drawings.pdf

153-cal-2002-granted-examination report.pdf

153-cal-2002-granted-form 1.pdf

153-cal-2002-granted-form 18.pdf

153-cal-2002-granted-form 2.pdf

153-cal-2002-granted-form 3.pdf

153-cal-2002-granted-form 5.pdf

153-cal-2002-granted-pa.pdf

153-cal-2002-granted-priority document.pdf

153-cal-2002-granted-reply to examination report.pdf

153-cal-2002-granted-specification.pdf

153-cal-2002-granted-translated copy of priority document.pdf