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(11) | EP 0 933 471 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Shoe press |
| (57) A shoe press for applying pressure to a moving web (W) of paper or the like includes
a press shoe extending along a full width of the web being carried through a nip (N)
defined between the shoe and a backing member (16), a support (18) for the shoe, and
a plurality of articulated hydraulic loading cylinders (20) arranged between the support
and the shoe for urging the shoe toward the backing member (16) to apply pressure
to the web. Each loading cylinder (20) includes a single piston (26) and first and
second cylinders (22, 24) attached to the shoe and to the support, respectively. The
opposite end portions of the piston are slidably received within the cylinders so
as to define working chambers (34) in the cylinders which are pressurizable by hydraulic
fluid for urging the two cylinders away from each other. The piston (26) engages the
cylinders (22, 24) at seals (32) which enable the piston to pivot with respect to
both cylinders about axes parallel to and perpendicular to the machine direction so
as to enable the loading cylinders to accommodate deformations and thermal expansion
of ,the shoe in the cross-machine direction and to allow the shoe to pivot about an
axis perpendicular to the machine direction. |