Rewinding machine for rewinding and forming a paper roll

Abstract

An improved rewinding machine for rewinding and forming a paper roll comprising three rollers ( 16, 17, 18 ) with axis parallel to each other and perpendicular to the direction of forward movement of the paper, wherein the two upper and lower winding rollers ( 16, 17 ) cooperate with a third roller ( 18 ), adapted to keep a given pressure on a roll, or log, to form a finished roll by winding of the paper, which passes on the upper winding roller ( 16 ), around a core ( 12 ), an introduction group ( 13 ) of the cores ( 12 ) one after the other into a channel ( 24 ) provided beneath the upper roller ( 16 ), and a paper stop group ( 120 ) which cooperates with at least one first surface portion ( 16′, 16″ ) of the upper roller ( 16 ) rotating around a pin ( 128 ), wherein the stop group ( 120 ) comprises at least one paper stop element ( 120′, 120″ ) provided with an arm ( 132′, 132″ ) rotating around the pin ( 128 ) and with a free end made up of a smooth surface ( 133′, 133″ ), and in which the at least one first surface portion ( 16′, 16″ ) of the upper roller ( 16 ) is smooth and provided with a plurality of air suctioning holes ( 101 ).

1 . Improved rewinding machine for rewinding and forming a paper roll comprising three rollers ( 16 ,  17 ,  18 ) with axis parallel to each other and perpendicular to the direction of forward movement of the paper, wherein the two upper and lower winding rollers ( 16 ,  17 ) cooperate with a third roller ( 18 ), connected by a pair of oscillating arms ( 22 ), adapted to keep a given pressure on a roll, or log, to form a finished roll, which exits from said machine through an exit opening ( 30 ) provided between said lower winding rollers ( 17 ) and said third roller ( 18 ), by winding of said paper, which passes on said upper winding roller ( 16 ), around a core ( 12 ), an introduction group ( 13 ) of said cores ( 12 ) one after the other into a channel ( 24 ) provided beneath said upper roller ( 16 ), and a paper stop group ( 120 ) which cooperates with at least one first surface portion ( 16 ′,  16 ″) of said upper roller ( 16 ) on which it operates rotating around a pin ( 128 ) parallel to said roller ( 16 ), wherein said stop group ( 120 ) comprises at least one said paper stop element ( 120 ′,  120 ″) provided with an arm ( 132 ′,  132 ″) rotating around said pin ( 128 ) and with a free end made up of a smooth surface ( 133 ′,  133 ″), and in which said at least one first surface portion ( 16 ′,  16 ″) of said upper roller ( 16 ) is smooth and provided with a plurality of air suctioning holes ( 101 ) for holding said paper wound on said upper roller ( 16 ). 
   
   
       2 . Machine according to  claim 1  characterised in that said stop group ( 120 ) comprises a plurality of said stop elements ( 120 ′,  120 ″) arranged successively one after the other and separated from each other by interspaces and in that said surface of said upper roller ( 16 ) comprises at least a second portion ( 116 ′,  116 ″) provided with friction material at said interspaces. 
   
   
       3 . Machine according to  claim 2  characterised in that said friction material is tungsten carbide. 
   
   
       4 . Machine according to  claim 1  characterised in that said at least one first smooth surface portion ( 16 ′,  16 ″) of said upper roller ( 16 ) on which said stop group ( 120 ) operates is made of aluminium. 
   
   
       5 . Machine according to  claim 1  characterised in that said at least one first smooth surface portion ( 16 ′,  16 ″) of said upper roller ( 16 ) on which said stop group ( 120 ) operates is made of iron. 
   
   
       6 . Machine according to  claim 1  characterised in that said smooth surface ( 133 ′,  133 ″) of said at least one stop element ( 120 ′,  120 ″) is made of friction material. 
   
   
       7 . Machine according to the preceding claim characterised in that said smooth surface ( 133 ′,  133 ″) is made of vulcanised rubber. 
   
   
       8 . Machine according to  claim 1  characterised in that said introduction group ( 13 ) comprises a pusher conveyor ( 15 ) upstream of said three rollers ( 16 ,  17 ,  18 ) for the introduction of said cores ( 12 ) one after the other into said channel ( 24 ) provided beneath said upper roller ( 16 ), and a rotating pusher ( 35 ) adapted to move said cores ( 12 ) forward into said channel ( 24 ). 
   
   
       9 . Machine according to  claim 1  characterised in that said upper roller ( 16 ) comprises a plurality of longitudinal channels ( 100 ) arranged as a circular ring in proximity to the cylindrical surface of said roller ( 16 ) arranged connected to the external through said plurality of holes ( 101 ). 
   
   
       10 . Machine according to  claim 9  characterised in that it comprises at least one pair of circular section-shaped sliding suctioning elements ( 102 ) arranged in axis with respect to said roller ( 16 ) fixed and facing the opposite tips adapted to trigger the air suctioning through the channels ( 100 ) comprised between them. 
   
   
       11 . Machine according to  claim 1  characterised in that said stop group ( 120 ) is arranged upstream of said channel ( 24 ). 
   
   
       12 . Machine according to  claim 1  characterised in that said stop group ( 120 ) is arranged inside said channel ( 24 ).