Applicator beam in a size press

Abstract

An applicator beam in a size press comprising a nip formed by a pair of press rolls between which a paper or board web is passed. The press rolls are provided with coating devices for spreading films of coating agent onto the faces of the rolls. The coating devices are mounted on applicator beams placed in the transverse direction of the machine. The applicator beams are linked pivotally on the frame of the size press or on the loading arms of a displaceable roll by a pivot shaft arranged transverse to the machine direction. The applicator beams are also provided with pivot cylinders by which the applicator beams can be pivoted between a closed position, i.e. the operating position, and an opened position, i.e. the service position. In accordance with the invention, in its cross section taken in a vertical plane in the longitudinal direction of the machine, the applicator beam is shaped so that at least the curved outer face of the applicator beam that is facing away from the corresponding press roll is curved. Moreover, the pivot shaft of the applicator beam is arranged so that when the applicator beam is pivoted around its pivot shaft, the distance from the curved outer face of the applicator beam to the other constructions of the machine placed close to the applicator beam, such as the tending bridge, remains substantially unchanged.