Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1995-02-09
1997-07-22
Mansen, Michael
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 18R, 384 99, B65H 7530, B65H 5400, F16C 2700
Patent
active
056496702
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a damping means for damping vibrations which may arise during the operation of a fast-rotating axle (e.g., of a chuck) in a filament spooling machine.
Damping means for a fast-rotating axle (of a gas turbine, for example) have been described in U.S. Pat. No. 4,669,893. A special application of damping means in drafting rollers for filament processing has been outlined in U.S. Pat. No. 5,159,166. A damping for a spooling machine has been shown in DE-A-42 40 920.
A chuck principally differs from a drafting roller in that a relatively long rotatable element is cantilever-mounted and that during operation it has to withstand a considerable growth in weight in the cantilever-mounted portion owing to the building of the bobbin. This problem has been described in detail in U.S. Pat. No. 3,917,182 (=DE-A 22 61 709). The solution proposed therein aims at reducing the critical speed of the arrangement in such a way that it is clearly below the operating range. In accordance with this proposal, one strives to influence the natural resonance of the arrangement. Respective means have been-shown in EP-A-234 844 (see, in particular, FIG. 8).
A chuck also differs from the drafting roller in that the external diameter of the rotatable element plays a critical role in the overall arrangement. The mantle surface of the chuck must receive bobbin tubes which are usually standardized. An increase of the diameter (so as to increase the stiffness) reduces the quantity of a given yarn which could be wound up on the bobbin. A shortening of the chuck (for the same purpose) has a similar effect.
Another difference between a chuck and a drafting roller is that the chuck cannot necessarily be designed anew for coping with higher speeds. On the contrary, it has to be adapted to many requirements of practical operation. In extending the field of application of a given chuck (e.g., in accordance with EP-A 217 276), one very quickly enters the resonance range of the second critical speed.
Contrary to the doctrine in accordance with U.S. Pat. No. 3,917,182, the present invention does not try to displace the resonance range by changing the design, but tries to dampen the oscillations in such a way that no substantial damage can occur thereby.
For this purpose the invention provides a damping for a fast-rotating axle (in particular a chuck) in a spooling machine which comprises a centering means so as to center the axle with respect to a fixing device, whereby a narrow annular space is formed, in which space there is provided a damping means encircling the axle.
The centering means is preferably arranged in such a way that it can exercise its function also in the event of cantilever mounting and of considerable changes in weight (e.g., during the formation of a docking) in the cantilever-mounted portion. This functions consists, in particular, of preventing any sagging from the cantilever-mounted portion or of keeping it within narrow limits. The centering means, however, enables the transmission of oscillations from the rotating axle to the damping means.
The damping means may comprise a liquid, i.e. be hydraulic. A supply of liquid can be provided so as to compensate for any losses during operation. In this case it is possible to provide a separate centering means. It is possible, for example, to provide spring elements for supporting a bearing for the axle with respect to an encasing. The damping liquid, however, could also be provided in a closed elastic container. In this case the container can be used as centering means.
Examples of these modifications are explained below in closer detail by reference to the enclosed drawings, in which:
FIG. 1 illustrates a cross sectional view of a chuck in accordance with the prior art illustrated in FIG. 1 of EP-A-217276;
FIG. 2 illustrates a part cross sectional view of a modified chuck of the prior art as shown in FIG. 2 of EP-A-217276;
FIG. 3 illustrates a cross sectional view of a bearing mounting with a damping means in accordance with the prior art shown in FIG. 3 of EP
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Busenhart Peter
Wirz Armin
Mansen Michael
Rieter Machine Works Ltd.
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