Metal working – Method of mechanical manufacture – Repairing
Reexamination Certificate
1999-09-15
2002-03-26
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Repairing
C029S898010, C029S898070
Reexamination Certificate
active
06360416
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
This application claims the priority of German application 198 49 233.2, filed in Germany on Oct. 26, 1998, the disclosure of which is expressly incorporated by reference herein.
The present invention relates to a process for exchanging the bearings of a traversing fiber guiding rod made of carbon fibers or the like in a textile machine producing x-packages (crosswound bobbins), in which machine the distance between two adjacent bearings corresponds to at least twice the traversing stroke.
Traversing yarn guiding rods are accelerated alternately by a traversing drive. In particular when the yarn guide rod has a high mass, for example when it is made of steel, the traversing gear is loaded with a high inertia force. In particular in the case of long textile machines, there are furthermore considerable delays in the return motion of direction. It has already been suggested, for example, in U.S. Pat. No. 5,447,795 that the yarn guiding rod be made of carbon fibers in order to reduce the inertia force. As carbon fiber yarn guiding rods are very inflexible, it is known from machines in practice that the bearing points for the yarn guiding rods are no longer, as was previously the case with steel yarn guiding rods, supported adjacent to each winding head, but rather the distance between the bearing points is increased.
Unfortunately, it has been shown that irregular wear occurs repeatedly in the case of the carbon fiber yarn guiding rods. This is disadvantageous as carbon fiber yarn guiding rods are very expensive. When wear occurs in the yarn guiding rods, replacing the bearings with replacement bearings is of no use, as replacement bearings continue to act with the worn areas of the yarn guiding rods.
It is an object of the present invention to significantly increase the life expectancy of the yarn guiding rods despite the occurring wear of traversing fiber carbon yarn guiding rods.
This object has been achieved in accordance with the present invention in that the bearings are collectively exchanged and replaced by replacement bearings, and that the replacement bearings are applied to new bearing points staggered in such a way to the old bearing points that the new bearing points are at a distance to the now exposed old bearing points, which distance corresponds to at least one traversing stroke.
The present invention is based on the knowledge that when the distance between two adjacent bearings corresponds to at least twice the traversing stroke, a maximum of half a length of the yarn guiding rod can be worn. The replacement bearings are then assembled at a new place at which the yarn guiding rod is not yet worn. For example, the bearings can be exchanged for new replacement bearings in yearly rotation. Such replacement bearings are, for example when they are designed as a plastic sliding bearing, decidedly cost-effective. The replacement bearings are then assembled, staggered, at a chosen distance, which must at least correspond to the traversing stroke. Prepared fixing surfaces can be provided on the textile machine for this purpose. As a result of this staggering, the newly applied replacement bearing acts with a nonworn part of the yarn guiding rod. This mating of material is thus ideal. The previous bearing point now remains free of all bearings. When the next change is due, the bearings move a further length along the rod, which length corresponds to at least one traversing stroke, for example the length of one winding station spacing. This process can be continued until the yarn guiding rod is worn practically all along its length and must be subsequently replaced. As a rule, this process can be applied three times.
Due to the process for exchanging the bearings according to the present invention, the exchange of a traversing yarn guiding rod or of individual parts for new ones is considerably delayed. For example, instead of having to change the yarn guiding rod every year, it can remain for double this time or even three times as long in the textile machine. The new replacement bearings are always applied there, where the yarn guiding rod shows no signs of wear.
In the case of a textile machine producing X-packages, in particular an open-end spinning machine comprising a traversing yarn guiding rod made of carbon fibers, it is purposeful when the bearing points for the replacement bearings to be installed are predetermined. Usually, adjacent to many winding stations or spinning stations, it is possible to affix the necessary sliding bearings or bearing rollers. The affixing points are prepared, even when, for example, only every third bearing point is needed for a bearing. The open-end spinning machine is therefore so designed that the replacement bearings can be installed at any chosen bearing points.
In a further embodiment of the present invention, the bearings are designed as sliding bearings open on one side. Sliding bearings have proven themselves in the case of traversing yarn guiding rods, as in their case no rotating bearing part needs to be additionally accelerated. If the sliding bearings are designed having one side open, a change is quickly and easily carried out without threading. The sliding bearings can be so designed that they vary in their supporting surfaces. For example, one sliding bearing supports only from below and laterally, the other from above, the next one guides from the left side, the one after that from the right side and so on.
The process according to the present invention can be applied advantageously when used textile machines, which have previously operated with yarn guiding rods made of steel and which have short distances between bearings, are modernized by means of re-equipping them with new parts. Firstly, in the case of such a modernization, a larger distance between the bearing points can be provided, and at the same time a carbon fiber yarn guiding rod can be applied, so that subsequently the changing of bearings can be carried out as described above. In a case like this, the process according to the present invention is particularly simple, as—due to the previous short distances between the bearing points—affixing points are already present adjacent to each winding point.
The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.
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Crowell & Moring LLP
Fritz Stahlecker
Hughes S. Thomas
Omgba Essama
LandOfFree
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