Abstract: The invention relates to a mechanical device which is used for the simultaneous longitudinal and transverse drawing of synthetic films, using successive clamps (13) for supporting, transporting and drawing said film (2). According to the invention, an endless chain (8) is provided on each side of the film, said chain comprising a succession of links (9, 10) which are articulated to one another using vertical shafts (11, 12). The aforementioned clamps (13), which are connected to one shaft (11) out of two, extend out over one side of the chain (8) and are guided on a first rail (14). The invention also comprises guide pieces (15) which are also connected to one shaft (12) out of two, between the clamps (13), and which move on a second rail (16). A variable spacing (E, e) is disposed between the two rails (14, 16), such that the links (9, 10) are essentially aligned or form angles so as to fix or modify the distance (d, D) between the clamps (13).