Device and process for handling and controlling the yarn of a crosswinding head of a crosswinding machine during the starting operations of a new lot

Abstract

The invention relates to a device and process for handling and controlling the yarn ( 2 ) in a crosswinding head of a crosswinding machine during the starting operations of a new lot, said crosswinding machine being equipped with a series of crosswinding heads and at least one service trolley ( 16 ), wherein the end of the yarn ( 2 ) of a new pirn is collected by the suction mouth ( 7 ) on the pirn ( 1 ) side and delivered to the joining device ( 9 ), from where it is, in turn, collected by the suction mouth ( 8 ) on the side of the bobbin and, after the suction mouth ( 8 ) has rotated until it is close to the driving and traversing cylinder ( 6 ), engaging the yarn ( 2 ) on its back during the movement, which is transferred from this to the handling device ( 15 ) of the service trolley ( 16 ).

1 . A process for handling and controlling the yarn ( 2 ) in a crosswinding head of a crosswinding machine during the starting operations of a new lot, said crosswinding machine being equipped with a series of crosswinding heads and at least one service trolley ( 16 ), each of said crosswinding heads comprising a pirn ( 1 ), from which a yarn ( 2 ) unwinds, which is wound to form a bobbin around a winding tube, a suction mouth ( 7 ) and a suction mouth ( 8 ), for the suction of the yarn ( 2 ) ends possibly formed, by breakage or cutting, on the side of the pirn ( 1 ) and on the side of the bobbin, respectively, and for the delivery of these ends to a joining device ( 9 ), situated along the run of the yarn ( 2 ) from the pirn ( 1 ) to the bobbin, for re-establishing the yarn continuity, said service trolley ( 16 ) sliding along the whole crosswinding machine so as to position itself in correspondence with each crosswinding head and comprising a handling device ( 15 ) of the yarn ( 2 ), characterized in that it comprises the following phases: 
 collection, by suction, of the yarn ( 2 ) end of a new pirn ( 1 ) on the part of the suction mouth ( 7 ) on the side of the pirn ( 1 ),    consignment of the yarn ( 2 ) from the suction mouth ( 7 ) on the side of the pirn ( 1 ) to the joining device ( 9 ),    collection, by suction, of the yarn ( 2 ) end coming from the pirn ( 1 ) and withheld by the joiner ( 9 ) on the part of the suction mouth ( 8 ) on the side of the bobbin,    collection of the yarn ( 2 ) withheld by the suction mouth ( 8 ) on the side of the bobbin by a handling device ( 15 ) of the service trolley ( 16 ),    positioning of a new winding tube of the yarn ( 2 ) coming from the pirn ( 1 ) and starting the formation of a new bobbin.    
     
     
         2 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that, after the collection phase of the yarn ( 2 ) on the part of the suction mouth ( 7 ) and before the consignment phase of the yarn ( 2 ) to the joining device ( 9 ), the following phase is included: 
 movement of the suction mouth ( 7 ) on the pirn ( 1 ) side, carrying the yarn ( 2 ) which is being unwound from the pirn ( 1 ) until it crosses the joining device ( 9 ).    
     
     
         3 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to claim  2 , characterized in that, during said movement phase of the suction mouth ( 7 ) on the side of the pirn ( 1 ), carrying the yarn ( 2 ) which is being unwound from the pirn ( 1 ), the yarn ( 2 ) is withheld with the use of a nipper ( 10 ) situated at the end of the suction mouth ( 7 ).  
     
     
         4 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 3 , characterized in that, while the yarn ( 2 ) is withheld by the nipper ( 10 ), situated at the end of the suction mouth ( 7 ), the suction of the suction mouth ( 7 ) is deactivated.  
     
     
         5 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that the delivery phase of the yarn ( 2 ) by the suction mouth ( 7 ) on the side of the pirn ( 1 ) to the joining device ( 9 ), includes the following sub-phase: 
 cutting of the yarn ( 2 ) on the part of the joiner ( 9 ), suction of the end ( 2 ′) above the cut on the part of the suction mouth ( 7 ) and withholding the part of the yarn ( 2 ) coming from the pirn ( 1 ) on the part of the joining device ( 9 ).    
     
     
         6 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that, said collection of the yarn ( 2 ) on the part of the suction mouth ( 8 ) on the side of the bobbin, comprises the following sub-phases: 
 movement of the suction mouth ( 8 ) on the side of the bobbin, from its rest position to a position in which the suction inlet ( 11 ) is in correspondence with the yarn ( 2 ) passing from the pirn ( 1 ) to the joining device ( 9 ),    suction of the yarn ( 2 ) part which comes from the pirn ( 1 ) on the part of the suction mouth ( 8 ) on the side of the bobbin and contemporaneous release on the part of the joining device ( 9 ).    
     
     
         7 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 6 , characterized in that, during the movement of the suction mouth ( 8 ) on the side of the bobbin, from its rest position to a position in which the suction inlet ( 11 ) is in correspondence with the yarn ( 2 ) passing from the pirn ( 1 ) to the joiner ( 9 ), the suction of the suction mouth ( 8 ) is deactivated.  
     
     
         8 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that, after the collection phase of the yarn ( 2 ) on the part of the suction mouth ( 8 ) and before the collection of the wire ( 2 ) by the handling device ( 15 ), the following phase is included: 
 movement of the suction mouth ( 8 ) on the side of the bobbin, with the suction activated, until it is positioned close to the driving and traversing cylinder ( 6 ), the suction mouth ( 8 ) engaging the yarn ( 2 ) on its back, during the movement.    
     
     
         9 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 8 , characterized in that, during the movement phase of the suction mouth ( 8 ) on the side of the bobbin until it is positioned close to the driving and traversing cylinder ( 6 ), the yarn ( 2 ) which is engaged on the back of the suction mouth ( 8 ) is compelled to assume a pre-established position.  
     
     
         10 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that, said yarn ( 2 ) collection phase on the part of the handling device ( 15 ) of the service trolley ( 16 ) comprises the following sub-phase: 
 nipping and cutting of the yarn ( 2 ) on the part of the handling device ( 15 ), which withholds the end of the yarn ( 2 ) coming from the pirn ( 1 ), whereas the end ( 2 ′) on the side of the inlet ( 11 ) of the suction mouth, is sucked and moved away.    
     
     
         11 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that the service trolley ( 16 ) is positioned in correspondence with the crosswinding head after the suction mouth ( 8 ) has reached the intervention position of the handling device ( 15 )  
     
     
         12 . The process for handling and controlling the yarn in a crosswinding head of a crosswinding machine during the starting operations of a new lot according to  claim 1 , characterized in that the service trolley ( 16 ) is positioned in correspondence with the crosswinding head after the suction mouth ( 8 ) has reached the intervention position of the handling device ( 15 ).  
     
     
         13 . A crosswinding machine comprising a series of crosswinding heads and at least one service trolley ( 16 ), each of said crosswinding heads comprising a pirn ( 1 ), from which a yarn ( 2 ) is unwound and which is wound to form a bobbin around a winding tube, a suction mouth ( 7 ) and a suction mouth ( 8 ), for the suction of the yarn ( 2 ) ends possibly formed, by cutting or breaking, on the side of the pirn ( 1 ) and on the side of the bobbin, respectively, and for the delivery of these ends to a joining device ( 9 ), situated along the yarn ( 2 ) run, from the pirn ( 1 ) to the bobbin, for re-establishing the yarn continuity, said service trolley ( 16 ) sliding along the whole crosswinding machine so as to position itself in correspondence with each crosswinding head and comprising a handling device ( 15 ) of the yarn ( 2 ), for effecting the process as defined in claims  1 - 12 , characterized in that each crosswinding head comprises means for the control and coordination of the movement and suction of the suction mouths ( 7 ) and ( 8 ).  
     
     
         14 . The crosswinding machine according to  claim 13 , characterized in that said suction mouth ( 7 ) on the side of the pirn ( 1 ) comprises a nipper ( 10 ) for blocking the yarn ( 2 ) even with the suction deactivated.  
     
     
         15 . The crosswinding machine according to  claim 13 , characterized in that said suction mouth ( 8 ) on the side of the bobbin comprises, on its back, a device for arranging the yarn ( 2 ) in a pre-established position.