The invention relates to a device for securing the pivot pin (9) of a type unit (3) to an actuator frame (5) of a self-inking stamp (1) having a reversing mechanism (2). Said device comprises at least one sleeve-type pin securing part (12) that is placed, when mounted, on a terminal area of the pivot pin (9) together with a sleeve base (95) and rests on the exterior with a radial projection (96) on the actuator frame (5). The sleeve base (95) comprises at least one tongue-shaped, resiliently radially deflected detent element (98) having a radially inward-pointing detent projection (99) that engages, when mounted, in a detent recess (101) in the pivot pin (9) in the terminal area thereof, said recess being provided as the mating detent element.