Textiles: weaving – Warp manipulation – Shedding
Patent
1988-09-21
1990-02-20
Falik, Andrew M.
Textiles: weaving
Warp manipulation
Shedding
D03C 906
Patent
active
049017675
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a supporting bar of a heddle frame including a frame stave and a heddle carrying rod mounted thereto.
The supporting bars of most of the presently employed heddle frames of textile machines, of which two respective ones are interconnected by lateral supports and form a frame termed heddle frame, comprise a hollow profile of light metal. According to a preferred design the heddle carrying rod is integrally mounted to the hollow profile of the frame stave, having a hollow rectangular cross-sectional profile, via an extended side wall of this hollow profile. The accordingly integral supporting bar may be produced as a drawn profile.
Presently, the longer the broader weaving machines are produced and due to technical improvements the speed of weaving machines is increased continuously such that the heddle frames which are reciprocatingly moved are subject to extremly high loadings. In order to guarantee the necessary bending resistance of the supporting bars it is accordingly necessary to select for the highly loaded heddle frames either a corresponding larger wall thickness or section, respectively for the hollow profile which leads to an increase of the weight and accordingly to an increase of the driving power, or it will be necessary to search for a different compromised solution and e.g. stiffen the light metal profile by steel inserts. Accordingly, it is known for instance to provide recesses in the edges of the light metal forming the hollow body and to insert stiffening rails of steel thereinto.
The steady increase of the loading of the heddle frames of modern weaving machines, specifically at the high speeds, necessitates, however, to account for the alternating bending strength of the material used for the heddle frames. For light metal, this alternating bending strength, drawn as a curve over a number of cycles of stress, decreases initially steeply down to a certain value and thereafter less steep, but still continuously, which does not occur for steel after reaching a certain limit value, such that for light metal due to the steadily declining curve at any given time the breakage due to increased loading can occur. This detrimentally influence the life time of the heddle frame. With regard to the alternating bending strength steel has a much better performance, however this material incorporates a high density which is a drawback for the object at hand.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a supporting bar of heddle frames made with regard to properties such as alternating bending strength, workability, etc. of the extremely suitable material such as steel, but of a light construction design which leads, regarding the weight, to a better result in comparison with a supporting bar of a light metal profile and, additionally is also realizable regarding the costs of production in relation to the final product.
The supporting bar of the invention is comprised of substantially planar combined sheet metal sections which guarantees that a supporting bar of a length of several meters and produced by combining sheet metal sections does not warp. To achieve this light structural design very thin sheets are used which allows their use on an assembling machine operating at high speeds whereby the operation suitably encompasses welding by a laser technique. To avoid bending of a long supporting bar the sheet metal sections forming the wall comprise at the longitudinal narrow sides of the frame stave a several times larger thickness of material than the sheet metal sections of the longitudinally extending broad sides of the frame stave which are welded to the narrow sides.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1-8 and 12 illustrate various embodiments of a supporting bar according to the invention in vertical section and in perspective view and partly broken away; and
FIGS. 9, 10 and 11 illustrate a vertical section through various embodiments of the supporting bar of FIG. 8.
DETAILED DESCRIPTION OF THE INVE
REFERENCES:
patent: 3754577 (1973-08-01), Heller
patent: 4144910 (1979-03-01), Bader
patent: 4387742 (1983-06-01), Graf
patent: 4706717 (1987-11-01), Root et al.
Falik Andrew M.
Grob & Co. Aktiengesellschaft
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