Transmission device for embossing rollers, comprising a pin (31) destined to be axially inserted into one end (100) of an embossing roller (1), the said pin (31) being motorized to drag the embossing roller (1) in rotation when it is inserted in said end (100). The said pin (31) is supported by elastic means (M1, M2,G) which allow its automatic alignment with a longitudinal axis (r) of the said end (100) of the embossing roller (1) during insertion of the pin (31) into the same end (100).