Abstract: The method for automatic separation of bundles of interfolded sheet articles is carried out in an interfolding machine that includes a folding unit (100), aimed at cutting the articles (1), folding them and forming an interfolded stack (2), and that includes also a separating device (10), situated downstream of the folding unit (100). The separation method includes: supporting the base of the stack (2) by first supporting planes (A) of the separator (10); lateral introduction of second supporting planes (B) and subsequent forming of an underlying bundle (3) of articles (1); separation of the bundle (3) and release thereof onto a conveyor (20); upwards movement of the first supporting planes (A) until they are placed directly underneath the second supporting planes (B); re-inserting of the first supporting planes (A) under the base of the stack (2); withdrawal of the second supporting planes (B) from the base of the stack (2).

Abstract: The device for driving folding arms of comb-like folding means along a closed operating path is used on an interfolding machine 100 for production of interfolded packs of sheets of tissue paper or another material and is mounted on a frame 10a situated in the lower part of the machine 100. A connecting rod-crank transmission assembly 13 is mounted on the frame 10a and connected to the comb-like 2, to drive the latter along the closed operating path. The driving device 10 comprises also a main motor 51, aimed at supplying at least a part of mechanical power necessary to drive the comb-like 2, and a supplementary motor 55, running at a controllable rotation speed, aimed at cooperating with the main motor 11, in driving the comb-like 2. An epicycloidal type differential 20, connected mechanically to the main and supplementary motors 51 and 55, and to the transmission assembly 13 as the combination of the power received at the intakes.