Abstract: A device for joining together in a registered and/or abutting manner the ends of two paper or cardboard webs which unwind from two different reels (17, 19) positioned on a reel star unit (10), comprised of a presser roller splicer (36), a cutting unit (38) for cutting the web to size and at least one photoelectric reader (30) which controls the stoppage of the web from the spent reel when in proper position for joining, its joining to the new web, and the cutting to size of the last end of said spent web.