Abstract: An automatic machine for continuously producing tinned strap caps fitted with a tear opening device, characterized by comprising a disc rotating about its axis at a constant speed, including a central portion and an outer circular crown, the latter being provided with a first plurality of supporting elements or lower slides, only radially movable to receive the caps supplied by a shaped double blade magazine, and a second plurality of supporting elements or upper slides, also only radially movable, to receive the tear opening devices supplied by a second double blade magazine, said crown being also provided with a plurality of passage holes, through which each of the tear elements are positioned on the corresponding cap, the central portion carrying a plurality of joining members only vertically movable, further characterized in that the radial movement for the lower slides adjacent the cap dispenser or magazine is controlled by a flat metal cam-shaped guide, during the movement of the rotable disc, drive rol