Abstract: A winding group for winding paper around a core to make a log which has in an upstream position, means for supplying glue onto the core, means for transporting and inserting the core provided with glue in a channel defined at the top by an upper winding roller, supplied from above with the paper directed towards the channel, and at the bottom by a cradle member associated downstream with a lower winding roller, the winding group comprising a third oscillating roller arranged above the lower winding roller, the three rollers having axes parallel to one another and perpendicular to the forward movement of the paper and cooperating with one another downstream of the channel to wind the paper around the core to obtain the log, further being provided cyclic means for tearing the paper moving forward on the upper winding roller, in which the means for supplying glue onto the core comprise means for depositing a plurality of circle arcs of glue on at least one outer portion of the core.

Abstract: A device, for separating the paper from the cores of rolls or logs of paper or similar products, which is based on a combination of a mandrel that receives trimmings from a roll or log where the mandrel has an outer diameter that is less than the inner diameter of a core of at least one log. The mandrel is provided with at least one axial recess that is directed along several contiguous generatrices of the mandrel. Above the axial recess is arranged a circular rotating blade which cuts both said trimmings the core.

Abstract: An improved device for gluing the end flap of a log and a gluing method which can be implemented in a machine for producing logs, in which the logs (14), which come from a re-reeling machine, are fed to a gluing device (11) comprising in succession a bottom unwinding roller (16) and a top feed belt (17), and, immediately downstream of the unwinding roller (16), at least one stretch of inclined surface (21), of a pre-set length, followed by a vacuum-suction roller (24), set on top of which is a top roller (25), and then by a glue dispenser (27), there being provided on top of the unwinding roller (16) a blower element (19) for blowing an end flap (29) of the log (14) and, underneath, a photo-electric cell (20) for detecting the end flap (29), in which the log fed to the unwinding roller (16) is set with a position of the free end staggered by an angle (?), which is a function of the diameter of the log and of the pre-set length of the stretch of inclined surface (21), in such a way that, when the log thus posi

Abstract: A gluing unit for an end edge of a log and un method implementable in a machine for making logs, wherein the logs (14), which come from a rereeling machine, are fed towards a gluing unit (11) comprising in succession a lower unwinding roller (16), and an upper feeder belt (17) and, immediately downstream of the unwinding roller (16) at least two sections of sloped surface (21, 23), of pre-selected length, followed by a suction roller with vacuum, positioned above which is an upper roller (25), and then a glue dispenser (27), provided above the unwinding roller (16) being an element (19) for blowing a final edge of the log (14) and beneath a photocell (20) for detecting the final edge (21), provided for being surface (34) for evacuating the glued log, provided for being a timing unit (22) for positioning the free end according to an angle (?) depending on the diameter of the log and the pre-selected length of the sloped surface section (21, 23) in such a manner that the log thus located is positioned on the su

Abstract: An embossing cylinder (10) comprising a central cylindrical body (11) and supports for bearings (12, 12?) projecting laterally from the circular ends of the central cylindrical body (11), wherein the central cylindrical body (11) comprises an internal cylindrical portion (13) and a coating (14), the coating (14) being provided molten on the internal cylindrical portion (13) and being made of softer material than the material that forms the internal cylindrical portion (13), easy to engrave and with high resistance against abrasion.