Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1984-05-02
1986-04-29
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335300, H01F 700
Patent
active
045860149
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
The application is a National Phase Application of PCT/AT 83/00026 filed 26 Aug. 1983 and based, in turn, on the Austrian application A 3294/82 of 2 Sept. 1982 under the International Convention.
FIELD OF THE INVENTION
The invention relates to an electromagnetic beam, or to a beam- or carrier-like worktable of any length for printing presses, coating and other processing machines operating with magnetic contact pressure, wherein at least one electromagnet with a magnet core and magnet coil, as well as a magnet connecting bridge and a supporting structure are provided. In certain cases, the magnetic beam according to the invention can also be incorporated into a roller. In this type of magnetic beam or worktable, a big problem is to keep them completely straight or level even in the case of large overall dimensions or work width, no matter what the temperature or working conditions are, so that they can be used for the highest precision requirements.
BACKGROUND OF THE INVENTION
The constructions known to the art consist mainly of a plate stiffened with a supporting structure, in which plate the electromagnets are mounted. Individual electromagnets are inserted into the plates with their open pole end (for instance threaded into it) and are connected to each other at the opposite pole end by a bridge.
Since it is desirable for the use of the magnetic beam and often required by the processing techniques, that the magnetic beam be as straight and level as possible, when overall dimensions are increased a stronger construction of the plate together with the supporting structure is required. The operating conditions, already severed due to mechanical rigidity reasons, as aforedescribed, in practice are more difficult because, depending upon use, the magnetic beams are subject to stress not only mechanically but above all electrically and, as a result, are exposed to significant temperature variations. In rest position, which means no current, the magnetic beam is cold. Depending on the applied contact pressure or current intensity, various high temperatures result.
Based on the current state of the art, it is almost impossible to build long magnetic beams, which means magnetic beams for large work widths, which are sufficiently stable regardless of temperature.
Based on the present state of the art, temperature related bending of magnetic beams of larger dimension are unavoidable. The size of such undesired deflections can reach more than 1 mm in the case of long magnetic beams and consequently can result in considerable inaccuracy for the process to be carried out with the aid of the magnetic beam.
Sometimes, cooling jets are incorporated as means to keep the temperatures and as a result the straightness constant. Other cooling methods are also available. Cooling systems are not only expensive but they also have to be considered as a poor means only to temporarily keep the heat conditioned deflections within somewhat acceptable limits.
Complete precision in the straightness of electromagnetic beams which are subject to various work loads or current intensities and temperature variations resulting therefrom can not be achieved with the present state of the art.
OBJECT OF THE INVENTION
The object of the present invention is a new construction concept which eliminates deflections due to temperature variations.
SUMMARY OF THE INVENTION
This invention is based on the discovery that the disturbing deflections are caused not by the absolute differences in temperature, but by the relative temperature differences occuring with respect to each other within the interior of the structure.
According to the invention with regard to the above-mentioned magnetic beam or beam- or carrier-like worktable, each magnet core is connected in a heatproof manner, at least at its pole and carrying the magnet connecting bridge, with a support profile symmetric to the plane of the axes of the magnet cores.
BRIEF DESCRIPTION OF THE DRAWING
The invention is further described with the a
REFERENCES:
patent: 2193162 (1940-03-01), Carter
patent: 2627007 (1953-01-01), Richards, Jr.
Dubno Herbert
Harris George
Ross Karl F.
Zimmer Johannes
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