Feeding device of a continuous elongated element, the device comprising: - a first roller and a second roller arranged side by side and having respective axes of rotation (101, 102) substantially parallel to each other; - a motor and a transmission mechanically connected to said first and second roller for rotating said first and second roller about said respective axes of rotation (101, 102) with a respective rotation speed, so as to limit or prevent a variation of said respective rotation speed of said first and second roller as a consequence of an action exerted on at least one of said first and second roller not generated by said motor, wherein said first and second roller have respective side surfaces which develop with cylindrical symmetry about the respective axis of rotation (101, 102), each side surface comprising a respective plurality of radial reliefs with circumferential closed development arranged in succession along a substantially axial direction, and wherein said pluralities of reliefs of said first and second roller are reciprocally intermeshed, wherein adjacent reliefs are in mutual close proximity along said substantially axial direction, for advancing, through said rotation of said first and second roller, said continuous elongated element along an advancement direction and cutting said continuous elongated element along a plurality of cutting lines substantially parallel to said advancement direction. - a first roller and a second roller arranged side by side and having respective axes of rotation (101, 102) substantially parallel to each other; - a motor and a transmission mechanically connected to said first and second roller for rotating said first and second roller about said respective axes of rotation (101, 102) with a respective rotation speed, so as to limit or prevent a variation of said respective rotation speed of said first and second roller as a consequence of an action exerted on at least one of said first and second roller not generated by said motor, wherein said first and second roller have respective side surfaces which develop with cylindrical symmetry about the respective axis of rotation (101, 102), each side surface comprising a respective plurality of radial reliefs with circumferential closed development arranged in succession along a substantially axial direction, and wherein said pluralities of reliefs of said first and second roller are reciprocally intermeshed, wherein adjacent reliefs are in mutual close proximity along said substantially axial direction, for advancing, through said rotation of said first and second roller, said continuous elongated element along an advancement direction and cutting said continuous elongated element along a plurality of cutting lines substantially parallel to said advancement direction. wherein said first and second roller have respective side surfaces which develop with cylindrical symmetry about the respective axis of rotation (101, 102), each side surface comprising a respective plurality of radial reliefs with circumferential closed development arranged in succession along a substantially axial direction, and wherein said pluralities of reliefs of said first and second roller are reciprocally intermeshed, wherein adjacent reliefs are in mutual close proximity along said substantially axial direction, for advancing, through said rotation of said first and second roller, said continuous elongated element along an advancement direction and cutting said continuous elongated element along a plurality of cutting lines substantially parallel to said advancement direction.