Presses – Concurrent pressing and conveying – Roll type
Patent
1988-12-12
1990-11-06
Stinson, Frankie L.
Presses
Concurrent pressing and conveying
Roll type
100163A, 100169, B30B 304
Patent
active
049676539
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a new and improved construction of a calender having displaceable bearing parts.
In its more particular aspects, the present invention relates to a new and improved construction of a calender having displaceable bearing parts and intermediate rolls which are arranged between an uppermost roll and a lowermost roll and supported at their respective axles. The displaceable bearing parts are secured at one side of nip-=relieving devices having an other side which is upported at an elevationally displaceable support member which is suspended at a stand. A slide guide is provided for elevationally displacing the bearing parts in the stand by means of bearing part portions which are adapted to the slide guide.
Such calenders are used, for example, in the paper industry for processing or refining paper webs. The calenders comprise a number of intermediate rolls which are arranged between an uppermost roll and a lowermost roll and can be pressed together by these uppermost and lowermost rolls. As a result, a pressure builds up between the rolls of the calender. Efforts are made to have, between the individual rolls, gaps, the so-called nips, possessing as far as possible the same clearance across the entire width of the nip. As is well known, this is adversely influenced by so-called overhanging weights which act upon each roll on both sides thereof in the downward direction. It is known to arrange nip relieving devices between the roll and the stand of the calender in order to compensate for the overhanging weights. In a known calender which, for example, is known from the European Patent Application No. 86116695.7 (W. G. Stotz), published Aug. 5, 1987 (Publication No. 0,230,563) and cognate with U.S. Pat. No. 4,736,678, granted Apr. 12, 1988, the nip relieving devices are hydraulic cylinder-and-piston motors by means of which a force is adjustable, which force acts against the force of the overhanging weights. The intermediate rolls are thereby mounted in bearing parts which are elevationally displaceable along a slide guide. Since in this calender the diameter of the individual rolls varies owing to wear of the surface thereof, the rolls are at times in a different elevational position. Such changes must be pursued also by the nip relieving device. Normally, the support members for the nip relieving devices are elevationally displaceably arranged at the stand. The main problem of the hitherto existing constructions results from the limited space which is available for the nip relieving devices between the individual rolls to be supported.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind it is a primary object of the present invention to provide a new and improved construction of a calender having displaceable bearing parts and which calender is not afflicted with the drawbacks and limitations of the prior art constructions heretofore discussed.
It is an important object of the present invention to provide a new and improved construction of a calender having displaceable bearing parts in which calender the nip relieving device and the displaceable support member are constructed in a manner which permits their use under the limited space conditions available in such calenders.
A further significant object of the present invention is directed to the provision of a new and improved construction of a calender having displaceable bearing parts and in which comparatively simple control means are employed for controlling the operation of the nip relieving device and the displaceable support member under the existing limited space conditions of such calenders.
Another noteworthy object of the present invention aims at providing a new and improved construction of a calender having displaceable bearing parts and containing displacement means which are constructed to render possible retrofitting existing calenders with the inventive construction.
Still a quite significant object of the present invention is directed to a new and improved construct
REFERENCES:
patent: 3364848 (1968-01-01), Muller
patent: 3777656 (1973-12-01), Muller
patent: 3867879 (1975-02-01), Schlunke et al.
patent: 4290351 (1981-09-01), Pay et al.
patent: 4347784 (1982-09-01), Pav et al.
patent: 4510859 (1985-04-01), Berry
patent: 4736678 (1982-04-01), Stotz
Kleeman Werner W.
Stinson Frankie L.
Sulzer Escher Wyss
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