Winding group and method for winding paper around a core to make a log

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.

1 . A winding group for winding paper around a core to obtain a log, comprising: in an upstream position means for dispensing glue onto said core, means for transporting and inserting said core provided with said glue into a channel defined at a top by an upper winding roller, supplied from above with said paper directed towards said channel, and at a bottom by a cradle member associated downstream to a lower winding roller, said winding group comprising a third oscillating roller arranged above said lower winding roller, said three rollers having respective axes parallel to each other and perpendicular to the feeding direction of said paper and cooperating with each other downstream of said channel in order to wind said paper around said core to obtain said log, further being provided cyclic means for tearing said paper moving forward on said upper winding roller, wherein said means for dispensing glue onto said core comprise means for depositing circle arcs ( 21 ) of glue on at least one outer portion of said core ( 11 ). 
   
   
       2 . The winding group of  claim 1 , wherein said means for dispensing glue onto said core comprise a container for the glue provided with an upwardly directed opening associated with said means for transporting and inserting said core, a movable member being provided housed within said container between a first position for receiving said glue and a second position for dispensing said glue onto said core moving forward on said transport and insertion means;
 said movable member comprising a plurality of circle arc-shaped convex free heads), each of said free heads being submerged in said glue in said first receiving position and projecting from said opening in said second dispensing position.   
   
   
       3 . The winding group of  claim 2 , wherein said means for transporting and inserting said core comprise conveyors with pushers. 
   
   
       4 . The winding group of  claim 3 , wherein conveyors comprise chains parallel to each other on which said pushers are spaced. 
   
   
       5 . The winding group of  claim 3 , wherein said circle arc-shaped convex free heads extend beyond said conveyors in said second dispensing position. 
   
   
       6 . The winding group of  claim 1 , wherein said means for transporting and inserting said core comprise a feeder arranged at the beginning of said channel and rotating around a pin in order to insert said core provided with glue inside said channel. 
   
   
       7 . The winding group of  claim 1 , wherein it comprises means for directing said core cooperating with said means for transporting and inserting said core. 
   
   
       8 . The winding group of  claim 1 , wherein said means for directing said core comprise an upper abutment plane for said core, which plane develops at least partially from said glue dispensing means towards said channel above said means for transporting and inserting said core and friction elements, said directing means imparting a controlled rotation to said core after said glue is dispensed. 
   
   
       9 . A winding method for winding paper around a core to obtain a log cyclically comprising the steps of:
 a) depositing glue on at least one outer portion of said core;   b) transporting and inserting said core provided with glue into a channel defined at the top by an upper winding roller and at the bottom by a cradle member associated downstream with a lower winding roller;   c) supplying said paper from above onto said upper winding roller towards said channel;   d) tearing said paper advancing on said upper winding roller upon insertion of said core provided with glue in said channel; and   e) winding said paper around said core to obtain said log downstream of said channel through cooperation of said upper and lower winding rollers with a third oscillating roller arranged above said lower winding roller, wherein said step of depositing glue on at least an outer portion of said core comprises the step of   f) depositing a plurality of glue circle arcs on at least one outer portion of said core.   
   
   
       10 . The method for winding of  claim 9 , wherein the method further it also comprises the step of directing said core provided with glue by means of an upper abutment plane and friction elements, upstream of said channel, which impart a controlled rotation to said core.