Abstract: An apparatus for automatic treatment and machining of tubular sleeves. The apparatus comprises a number of stations in which various kinds of treatments and machining operations are performed. Each station comprises a clamping means in which the tubular sleeve rests while the treatment or machining operation associated with that station is being performed. Each station also comprises a movable carriage designed to adapt the station to tubular sleeves of various lengths.At each end of the tubular sleeve the stations are provided with one pivotable arm each, designed to lift the tubular sleeve away from the clamping means and advance it in a controlled manner to the next station. The stations are equipped with tools designed to treat and machine the tubular sleeve. One of the tools is movably mounted on the carriage.

Abstract: The invention concerns a rotating heat-exchanger comprising a cylinder having an inner jacket, and outer jacket and a section intermediate the jackets for the heat-exchanging medium. The heat-exchanger is particularly intended for use in paper-making machines and paper converting machines. The invention solves the problem in such cylinders or rollers of reducing the rotating mass. In accordance with the teachings of the invention this is made possible by rotating only the outer jacket whereas the inner jacket and the central shaft or equivalent means are stationary.