Patent ID: 8302900

Claim:
A rewinder for winding paper around a core for making a log, comprising: an upper winding roller; a lower winding roller; a cradle associated with said lower winding roller; a channel defined at a top by said upper winding roller, which is supplied from above with said paper directed towards said channel, and at a bottom by said cradle member associated downstream with said lower winding roller; means for transporting and introducing said core into said channel; means to cause said initial edge to wind on said core introduced into said channel; a third oscillating roller arranged above said lower winding roller, said upper winding roller, said lower winding roller and said third oscillating roller having axes parallel to each other and perpendicular to a forward movement of said paper and cooperating downstream of said channel to wind said paper around said core to make said log; and tearing means for tearing said paper moving forward on said upper winding roller to identify a final edge and an initial edge, wherein said tearing means comprise comprises at least one tearing head, which is cyclically mobile and alternates between a first inoperative position distant from said upper winding roller and a second operative position in contact with said paper moving forward on said upper winding roller, said second operative position being substantially instantaneous and without sliding along said upper winding roller, and wherein, at said second operative position, an approach, contact and separation trajectory of said at least one tearing head with respect to said upper winding roller, said at least one tearing head defines a maximum angle of about ±20° perpendicular to the forward movement of said paper on said upper winding roller.