Buffer having a self-adjustable stopper

A buffer with a self-adjustable stopper comprising a buffer head having an upper surface as a stopper, a base having a guide profile, and comprising a central body having a groove cooperating with said guide profile, the central body being mounted on the base by a translation movement, in a first direction (X) in a plane of movement, the central body at least partially receiving the buffer head by a face opposite to that in contact with the base,

• characterized in that the buffer head being movable relative to the central body in a third direction (Z) perpendicular to the plane of movement, and in that the buffer further comprises a locking member inserted into the central body in a second direction (Y) perpendicular to the first and third directions, and operable in translation for blocking in the third direction (Z) the buffer head in the central body and blocking in the first direction (X) the central body on the base.