Synthetic-resin core for winding yarn into reels with slots, for automatically retaining the turns of reserve yarn

Abstract

In the stepped cylindrical wall ( 3 ) for the reserve turns there are provided three slots ( 5 ), extending circumferentially and each having a plurality of appendages ( 7, 7, 9 ) that project with a profile leading into the slot from the opposite sides of the slot and are staggered with respect to each other, so that as the yarn F penetrates into the slot ( 5 ) it is derived in a wavy configuration by the appendages ( 7, 7, 9 ); thus an effect of retaining the reserve turns of yarn is achieved.

1 . A synthetic resin core for the winding yarn into reels, with automatic retaining means for the turns of reserve yarn, characterized in that at least one of its ends, where turns of reserve yarn are to be formed, has a cylindrical surface ( 3 ) without an annular channel but with at least one slot ( 5 ) extending circumferentially along said cylindrical surface.  
     
     
         2 . The core as claimed in  claim 1 , characterized in that the slot or each slot ( 5 ) has a “wavy” configuration into which the corresponding portions of the turns of reserve yarn penetrate and are retained therein.  
     
     
         3 . The core as claimed in  claim 1 , characterized in that each slot ( 5 ) has a plurality of appendages ( 7 ,  9 ) that project into the slot from the opposite longitudinal sides of said slot ( 5 ) and are staggered with respect to each other.  
     
     
         4 . The core as claimed in  claim 1 , characterized in that the appendage or appendages extending from one side of the slot ( 5 ) have their ends spaced apart from the opposite side of the slot by a certain distance that is less than the projection of the appendage or appendages extending from said opposite side of the slot, so that the turns of reserve yarn are inserted into the slot with a slightly wavy configuration, until they ride over said appendages.  
     
     
         5 . The core as claimed in  claim 1 , characterized in that a wall ( 11 A;  111 A) of cylindrical configuration is present inside the slots ( 5 ), said wall possibly being annular.  
     
     
         6 . A synthetic resin core for winding yarn into reels, with slots for automatically retaining the turns of reserve yarn; the whole as described above and as represented in the attached drawing.