Presses – Concurrent pressing and conveying – Roll type
Patent
1993-08-09
1995-04-11
Gerrity, Stephen F.
Presses
Concurrent pressing and conveying
Roll type
100153, 100162B, 100168, 162273, 1623603, D21G 100, B30B 304, D21F 302
Patent
active
054048117
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a roll press, preferably for the treatment of a traveling web, for instance a web of paper. The roll press comprises two press units, for example press rolls, the main axes of which lie in a pressing plane and form with each other a press nip through which the web travels. The roll press can also comprise three press units which form two press nips, or four press units which form three press nips.
The invention proceeds from a roll press having the following features. It is a roll press for the treatment of a traveling web of paper having two press units which may be in the form of press rolls. Each press unit, hereafter called a press roll, has a respective axis. The axes together lie in a press plane. The press rolls are so placed as to define a first press nip between them. One of the two press rolls includes a stationary support member that supports a traveling or circulating press element around the support member and that supports an internal pressing device for radially outwardly biasing the traveling or circulating press element toward the web and the other press roll. There are respective bearing brackets at each end of each of the press rolls. The bearing brackets at each end of the rolls are connected to each other by detachable tension bars which transmit the pressing force between the bearing brackets at the respective roll end. One set of the bearing brackets for one of the press rolls are rigidly supported on a machine frame or foundation and bear or support the weight of the other press roll. As prior art, reference is had to WO 92/17641 published after the priority date claimed.
Explanation of a few terms:
The "main axis" of a press unit can, for instance, be the axis of rotation of a press-roll jacket or the longitudinal axis of the stationary support member of, for instance, a shoe-press unit (in the latter case, the axis of rotation can be arranged eccentric to the main axis).
The "rotating press element" can be a metallic press-roll jacket which is rotatable around a stationary support member and is displaceable radially relative to it, or a press traveling or circulating belt or tubular traveling or circulating press jacket in the case of a shoe press unit.
The "internal pressing device" can be either a pressure chamber in the shape of a half ring or a row of radially movable support elements, or else an elongated radially movable press shoe.
The "one press unit", the bearing brackets of which are rigidly supported, is arranged on a frame, foundation or the like or is fastened (by means of its brackets) suspended from a (for instance, vertical or horizontal) support. The "other press unit" can be arranged above, to the side of, or below the rigidly supported press unit; its weight is borne by the bearing brackets of the rigidly supported press unit. The expression "rigidly supported" covers also the bipartite bearing-bracket construction with axial guide elements in accordance, for instance, with Federal Republic of Germany Utility Model 92 04 405.0.
One essential feature of the roll press from which the present invention proceeds is that the bearing brackets are coupled to each other in pairs by means of detachable tension bars. These tension bars are the sole element for transmitting the pressing force from bearing bracket to bearing bracket. Thus, the machine frames of the roll press need be dimensioned only for the weight of the press units themselves, and not for the transmission of the pressing force. It is also important that the tension bars are easily detachable; therefore, with zero pressing force, they are preferably pretensioned to at most a fraction of the maximum pressing force.
Furthermore, these tension bars are in a certain sense movable or flexible so that the bearing brackets of the "other press unit" are movable parallel to the pressing plane relative to the bearing brackets of the rigidly supported press unit. This is in contradiction to the manner of construction in accordance with U.S. Pat. No. 3,921,
REFERENCES:
patent: 1073611 (1913-09-01), Lindemann
patent: 2720910 (1955-10-01), Rockstrom et al.
patent: 3515637 (1970-06-01), Reynolds et al.
patent: 3983811 (1976-10-01), Fuchs et al.
patent: 4272317 (1981-06-01), Roerig
patent: 4790908 (1988-12-01), Roerig et al.
patent: 4877487 (1989-10-01), Miller
patent: 4973384 (1990-11-01), Crouse et al.
patent: 5087325 (1992-02-01), Page
Grabscheid Joachim
Schiel Christian
Gerrity Stephen F.
J. M. Voith GmbH
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