Abstract: A positioning device has a pneumatic motor for longitudinally translating an arm. Four bars are parallel with the arm and form three guideways along which stopping devices can be lockable in desired positions. The stopping devices have heads that are selectively activatable into positions to form abutments for a head of the arm in order to define stop positions for the arm when the arm is moved by the motor that stalls when the arm is stopped. A shock absorber provides for a gentle stopping of the arm and its distance of operation prior to a stop position varies with the distance of displacement of the arm.

Abstract: Web or sheet material is carried on air to advance the material in a fixed stable floating position through one or more decks of a treating plant, preferably a drier. Fixing chambers providing an air flow substantially parallel to the plane of the material and blow boxes with an air flow substantial perpendicular to said plane of the material are located adjacent each other on both sides of the material and are arranged to face each other mutually on the opposite sides of the plane of the material.

Abstract: Web or sheet material is carried on air to advance the material in a fixed stable floating position through one or more decks of a treating plant, preferably a drier. Spaced fixing chambers carried out with an air flow substantially parallel to the plane of material are mounted on either side of material and arranged to co-operate with blow boxes carried out for an air flow substantially perpendicular to said material plane, said blow boxes located partly on opposite sides of the material facing the fixing chambers, partly between said chambers.