Spindle for winding yarns in winding tubes or tubular winding cores

Abstract

The spindle ( 1 ) comprises, in proximity of one end, an axial locking member ( 21 ) of the winding tube ( 3 ). The locking member can assume an active condition of axial locking of the tube as a result of rotation of the spindle and an inactive position when the spindle is not moving.

1 . A spindle for winding a yarn on a winding tube, the spindle comprising:
 a base;   a free end opposite said base;   an axial locking member of the winding tube, said axial locking member being in proximity of said free end, said locking member being able to assume an active condition of axial locking of the tube as a result of rotation of the spindle and an inactive position when the spindle is not moving, wherein said axial locking member is stressed in the inactive position through gravity and said axial locking member is activated in the locking position through centrifugal force.   
   
   
       2 . A spindle as claimed in  claim 1 , wherein said axial locking member comprises radially expansible elements associated with the free end of said spindle. 
   
   
       3 . A spindle as claimed in  claim 1 , wherein said axial locking element comprises tabs oscillating about substantially horizontal axes, said tabs being arranged in a retracted position as a result of the weight thereof when the spindle is not moving or said tabs rotating at a limited angular speed, and in an extracted position when the spindle rotates at a speed that is greater than a minimum angular speed. 
   
   
       4 . A spindle as claimed in  claim 1 , further comprising a gasket cooperating with a radial constraining surface provided inside the winding tube, said gasket being in a position axially retracted with respect to said axial locking member. 
   
   
       5 . A spindle as claimed in  claim 4 , wherein said gasket comprises a radial elastic expansion. 
   
   
       6 . A spindle as claimed  claim 3 , wherein said tabs are housed inside housings provided in the shaft in said inactive position. 
   
   
       7 . A unit, comprising:
 a winding tube; and   a spindle comprising a base, a free end opposite said base and an axial locking member of the winding tube, said axial locking member being in proximity of said free end, said locking member being able to assume an active condition of axial locking of the tube as a result of rotation of the spindle and an inactive position when the spindle is not moving, wherein said axial locking member is stressed in the inactive position through gravity and said axial locking member is activated in the locking position through centrifugal force, wherein said winding tube has a conical collar snap fitted inside the winding tube in a position such that said axial locking member is arranged above said conical collar when said winding tube is fitted on said spindle.   
   
   
       8 . A spindle as claimed in  claim 2 , wherein said axial locking element comprises tabs oscillating about substantially horizontal axes, said tabs being arranged in a retracted position as a result of the weight thereof when the spindle is not moving or said tabs rotating at a limited angular speed, and in an extracted position when the spindle rotates at a speed that is greater than a minimum angular speed. 
   
   
       9 . A spindle as claimed in  claim 2 , further comprising a gasket cooperating with a radial constraining surface provided inside the winding tube, said gasket being in a position axially retracted with respect to said axial locking member. 
   
   
       10 . A spindle as claimed in  claim 3 , further comprising a gasket cooperating with a radial constraining surface provided inside the winding tube, said gasket being in a position axially retracted with respect to said axial locking member. 
   
   
       11 . A spindle as claimed in  claim 8 , further comprising a gasket cooperating with a radial constraining surface provided inside the winding tube, said gasket being in a position axially retracted with respect to said axial locking member.