Abstract: A device for making security marks by means of a plurality of simultaneously backing and printing dies, each with a pre-designed image. The device makes it possible to subject a sheet of paper to a novelty simultaneous abrasion and printing method of a security mark using the dies previously and smoothly inked by means of inking rollers with either one or more inks not visible to the naked eye, but revealable by one or more temporarily applicable revealing stimuli, wherein the security mark shows as authentication evidence a pre-designed image invisible to the naked eye, but which becomes visible in many different ways, and at least one second form of verification under a revealing stimulus, wherein all forms in which the images are revealed on the paper have an absolute matching location because they are produced simultaneously and by the same backing and printing die.

Abstract: Device for obtaining safety stamps applicable to paper or other laminar elements. Said device comprises a supporting cylinder (a) for paper (3) fitted with reliefs (5) separated from an abrasive periphery (2') wheel (b) along a distance that is shorter than the height of said relief (5) peaks (5); the device includes antisliding pressure means (c) and adjustment means (d) for applying the paper (3) to the cylinder (a) side walls (1'), in addition to angular drive means (15) in said supporting cylinder (a). In view that the distance separating the abrasive wheel (b) from the supporting cylinder (a) is shorter than the height of the relief (5) peaks (5') when the relief (5) enters the contact zone, the abrasive periphery (2') of the wheel (b) abrades the ends of said peaks (5'), resulting in a water mark being implemented. The antisliding pressure means (c) secure the paper (3) in place, while the adjustment means (d) preclude any paper (3) maladjustment in the critical abrasion zone.