Pneumatic linear ejector of the type attachable to an arm of a movable arm unwinder

Abstract

A pneumatic linear ejector ( 1 ) of the type attachable to an arm ( 101 ) of a movable arm unwinder ( 100 ) for reels ( 102 ); the ejector ( 1 ) comprising a plurality of segments ( 2 a, 2 b, 2 c ) nested one in the other and slidable over each other, each having a respective seat ( 3 ) for the passage and/or accommodation of a chuck ( 104 ) configured to grasp a core ( 106 ) of a reel ( 102 ), the seats ( 3 ) are coaxial and define a central axis (A); the first segment ( 2 a ) is defined by an annular cylinder ( 20 ) attachable to an unwinder ( 100 ) and having a base ( 21 ) adapted to face the unwinder ( 100 ); a closing portion ( 25 ) is fixed to the first segment ( 2 a ) and closes the seat ( 3 ), the closing portion ( 25 ) is configured to support the chuck ( 104 ).

1 . A pneumatic linear ejector of the type attachable to an arm of a movable arm unwinder for reels; said ejector comprising a plurality of segments nested one in the other and slidable over each other, the first segment and the second segment having each a respective central seat for the passage and/or accommodation of a chuck configured to grasp a core of a reel, said seats being coaxial and defining a central axis; the first segment being defined by an annular cylinder which is attachable to an unwinder and having a base adapted to face said unwinder; the ejector also comprising a closing portion fixed to the first segment and closing the seat, said closing portion being configured to support said chuck. 
     
     
         2 . An ejector as claimed in  claim 1 , wherein said first segment has an inner wall defining the seat, said closing portion being connected to said inner wall. 
     
     
         3 . An ejector as claimed in  claim 2 , wherein said first segment comprises a first opening located on said inner wall. 
     
     
         4 . An ejector as claimed in  claim 3 , wherein said opening is arranged between said closing portion and said base. 
     
     
         5 . An ejector as claimed in  claim 1 , wherein the second segment is defined by an annular piston inserted in said annular cylinder, the second segment having a plurality of cylinders, the last segment being defined by a plurality of pistons each inserted in a respective cylinder of the second segment. 
     
     
         6 . An ejector as claimed in  claim 5 , wherein the cylinders of second segment are angularly equally spaced with respect to said central axis. 
     
     
         7 . An ejector as claimed in  claim 5 , wherein the cylinders of the second segment are in fluid communication with the annular cylinder of the first segment. 
     
     
         8 . A kit comprising a linear ejector of the type adapted to be connected to an arm of a movable arm unwinder as claimed in  claim 1 , wherein said annular cylinder has an outer wall having a second opening, said kit further comprising an adapter having an annular cavity adapted to be connected with a fluid source and to be positioned at said second opening for introducing fluid into said annular cylinder 
     
     
         9 . A kit as claimed in  claim 8 , wherein said adapter comprises a pair of sealing rings which are adapted to be associated with the outer wall of the annular cylinder. 
     
     
         10 . A kit as claimed in  claim 8 , wherein said adapter has an outer cylindrical wall and optionally an inner cylindrical wall adapted to be fixed to the annular cylinder and has at least one opening adapted to be placed at the second opening of the annular cylinder, said adapter comprising at least one bearing adapted to be arranged between the outer cylindrical wall of the adapter and the outer wall of the annular cylinder or between the outer cylindrical wall and the inner cylindrical wall of the adapter. 
     
     
         11 . An unwinder for reels comprising a pair of vertically arranged arms adapted to move away from and/or toward each other, a horizontally arranged shaft connected to an upper end of one of said arms; a chuck coaxially connected to said shaft; at least one ejector as claimed in  claim 1 , said chuck being fixed to the closing portion of said ejector.