Winding – tensioning – or guiding – Strand tensioning device – Clamp
Patent
1998-03-30
1999-11-09
Mansen, Michael R.
Winding, tensioning, or guiding
Strand tensioning device
Clamp
B65H 5922
Patent
active
059798106
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a yarn brake with two preferably disc-shaped or plate-shaped brake elements pressed resiliently against one another by magnetic loading.
2. Discussion of the Relevant Art
Yarn brakes of this type are used to a great extent for imparting yarn tension to running yarns on textile machines and are known, for example, from EP 499 218 A2, DE-A 20 00 268, DE-C 864 073, GB-A 850,858 or DE 43 01 507 A1.
These publications propose a yarn brake, in which the brake plates are induced to clamp or brake the yarn by means of opposite-pole magnetic rings. The braking force may be exerted in each case via a permanently magnetic ring which is arranged on the brake plate and which is fixed relative to the brake plate via a thread. The forces of attraction of opposite-pole permanent magnets depend on the distance between the two permanently magnetic rings, there being an approximately square relation between the magnitude of the force of attraction and the distance. The braking force may thereby be set appropriately for the particular purpose. However, the disadvantage of this arrangement and design of brake plates having opposite-pole magnetic rings is that it is not properly possible to operate the yarn brake independently of position, and that sensitive adjustability of the braking force from zero up to the full locking of the brake is made difficult.
Furthermore, the older application DE 44 09 450 A1 disclosed a generic yarn brake, in which additional axially polarized magnets are provided on the bearing shaft in order to assist the centring of the brake plates. The magnets are polarized in such a way that they axially repell the brake plate located in front of them in each case. At least one of the additional magnets is arranged axially adjustably on the bearing shaft.
The yarn brakes known from the prior art described above have in common the fact that relatively complicated solutions are provided in order to allow self-cleaning and, at the same time, sufficient fine adjustment of the braking force to achieve a high degree of operating reliability.
SUMMARY OF THE INVENTION
The object on which the invention, therefore, to provide a yarn brake of the type mentioned in the introduction, in which the rotatability of at least one or of both brake plates for self-cleaning is achieved and maintained in a simple and cost-effective way and sensitive adjustability of the braking force and universal use in any installation position and for different textile yarns in textile machines become possible.
A yarn brake comprising a first and a second disc- or plate-shaped brake elements between which at least one yarn to be braked can be led through a first magnetic loading device, a second magnetic loading device that is adjustable, a bearing shaft on which said first and second brake elements are mounted to rotate freely about said bearing shaft, a stop arranged separately from said brake elements, a cover receiving said second magnetic loading device arranged on said second brake element, and an adjusting unit.
The first and second brake elements are pressed in resiliently against one another by the first and second magnetic loading devices. The first magnetic loading device is located on only one of the first and second brake elements. The second magnetic loading device is arranged separately from the first and second brake elements in such a way to press one of the first and second brake elements against the stop, and the adjusting unit adjusts the force of the first and second magnetic loading devices to adjust the press of the second brake element against the first brake element.
The separate or contactless arrangement of the loading elements makes it possible to provide a yarn brake which has two brake elements pressed resiliently against one another by loading means and in which the brake elements can be freely movable on the bearing shaft. At the same time, the brake plate provided with the loading means is pressed against the opposite brake plat
REFERENCES:
patent: 2614773 (1952-10-01), Ammerall
patent: 2650043 (1953-08-01), Grein
patent: 3001946 (1961-09-01), Jentschmann
patent: 4462557 (1984-07-01), Warner
patent: 5294071 (1994-03-01), Hartel et al.
patent: 5301895 (1994-04-01), Sheehan et al.
patent: 5782424 (1998-07-01), Horvath et al.
Barth-Tex Instruments & Software GmbH & Co.
Mansen Michael R.
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