Abstract: An automatic web winder for winding a continuous web into rolls of predetermined length, the winder including a feed assembly, cutting assembly and measuring assembly positioned to feed the web into a mandrel assembly, the mandrel assembly including a mandrel having a feed-through slot for receiving the lead end of the web, an apron assembly for directing the lead end of the web into the slot and a resolver for indicating the angular position of the slot at the end of each cycle, the signal of the resolver being sensed and used to orient the mandrel to a position where the slot is aligned to receive the lead end of the web in the shortest angular motion, and a roll ejector assembly for automatically ejecting the roll from the mandrel at the end of a cycle of operation, the ejector assembly being activated by the movement of a mandrel bearing support assembly which is moved away from one end of the mandrel to release the roll for ejection from the mandrel.