Device and process for the handling and control of the yarn in a crosswinding head of a crosswinding machine in bobbin doffing operations

Abstract

The invention relates to a device and a process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations, said crosswinding machine being equipped with a series of crosswinding heads and at least one service trolley ( 13 ), in which the yarn ( 1 ) run is moved to a definite position, near the end portion of its course from the pirn to the bobbin ( 2 ) and the yarn ( 1 ) is subsequently drawn from a handling device ( 12 ) of the service trolley ( 13 ), cut and, after removal of the bobbin ( 2 ), its end coming from the pirn, is arranged on a new winding tube.

1 . A process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations, said crosswinding machine being equipped with a series of crosswinding heads and with at least one service trolley ( 13 ), each of said crosswinding heads comprising a pirn, from which a yarn ( 1 ) is unravelled and is wound to form a bobbin ( 2 ), around a winding tube, two mouths for the suction of the yarn ( 1 ) ends possibly formed, by breakage or cutting, on the side of the pirn or on the side of the bobbin ( 2 ) respectively, and for the delivery of these ends to a joining device ( 7 ), situated along the run of the yarn ( 1 ) from the pirn to the bobbin ( 2 ), to re-establish the yarn continuity, said service trolley ( 13 ) being capable of running along the whole crosswinding machine, in order to position itself in correspondence with each crosswinding head and comprising a manipulation device ( 12 ) of the yarn ( 1 ) characterized in that it comprises the following phases: 
 moving of the yarn ( 1 ) run in a defined position, near the terminal portion of its course from the pirn to the bobbin ( 2 ),    seizure and cutting of the yarn ( 1 ), in correspondence with said defined position on the part of a manipulation device ( 12 ) of the service trolley ( 13 ), which withholds the end coming from the pirn,    distancing of the bobbin ( 2 ), arrangement on a new winding tube of the yarn ( 1 ) coming from the pirn and start of the formation of a new bobbin.    
     
     
         2 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 1 , characterized in that it comprises the following preliminary phase: 
 interruption of the winding of the yarn ( 1 ) onto the bobbin ( 2 ).    
     
     
         3 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 2 , characterized in that said interruption phase of the yarn ( 1 ) winding onto the bobbin ( 2 ) comprises the following sub-phase: 
 stoppage of the bobbin ( 2 ) rotation.    
     
     
         4 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 2 , characterized in that said interruption phase of the yarn ( 1 ) winding onto the bobbin ( 2 ) comprises the following sub-phases: 
 cutting of the yarn ( 1 ),    slowing down of the rotation of the bobbin ( 2 ),    rejoining of the two cut yarn ( 1 ) ends, and    stoppage of the rotation of the bobbin ( 2 ).    
     
     
         5 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 1 , characterized in that said movement phase of the yarn ( 1 ) run to a definite position, is effected by positioning means present on each crosswinding head.  
     
     
         6 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 1 , characterized in that said movement phase of the yarn ( 1 ) run to a definite position, is effected by positioning means present on the service trolley ( 13 ).  
     
     
         7 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 1 , characterized in that said movement phase of the yarn ( 1 ) run to a definite position, is effected by positioning means situated on the back of the suction mouth ( 6 ) on the side of the bobbin and comprising the following sub-phase: 
 movement of the sucking ( 6 ) mouth on the side of the bobbin from its rest position, in correspondence with the joining device ( 7 ), to the intervention position of the manipulating device ( 12 ), during the movement of the suction mouth ( 6 ), the yarn ( 1 ) being engaged on its back in correspondence with said positioning means.    
     
     
         8 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 7 , characterized in that during the movement phase of the suction mouth ( 6 ), the yarn ( 1 ) which is engaged on the back of the suction mouth ( 6 ) unravels from the pirn.  
     
     
         9 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 7 , characterized in that it comprises a return phase of the suction mouth ( 6 ) to its rest position, following the collection and cutting phase of the yarn ( 1 ) on the part of the manipulating device ( 12 ), during which the manipulating device ( 12 ) moves away from the crosswinding head so as not to obstruct the movement of the suction mouth ( 6 ).  
     
     
         10 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 1 , characterized in that the service trolley ( 13 ) is positioned in correspondence with the crosswinding head before the suction mouth ( 6 ) begins moving towards the bobbin ( 2 ).  
     
     
         11 . The process for the handling and control of the yarn ( 1 ) in a crosswinding head of a crosswinding machine in bobbin ( 2 ) doffing operations according to  claim 1 , characterized in that the service trolley ( 13 ) is positioned in correspondence with the crosswinding head after the suction mouth ( 6 ) has reached the intervention position of the manipulating arm ( 12 ).  
     
     
         12 . A crosswinding machine comprising a series of crosswinding heads and at least one service trolley ( 13 ), each of said crosswinding heads comprising a pirn, from which a yarn ( 1 ) is unravelled and is wound around a bobbin ( 2 ), two mouths for the suction of the yarn ( 1 ) ends possibly formed, by breakage or cutting, on the side of the pirn or on the side of the bobbin ( 2 ) respectively, and for the delivery of these ends to a joining device ( 7 ), situated along the run of the yarn ( 1 ) from the pirn to the bobbin ( 2 ), to re-establish the yarn continuity, said service trolley ( 13 ) being capable of running along the whole crosswinding machine, in order to position itself in correspondence with each crosswinding head and comprising a manipulation device ( 12 ) of the yarn ( 1 ) characterized in that it comprises means for moving the run of the yarn ( 1 ) to a definite position, close to the terminal portion of its course from the pirn to the bobbin ( 2 ), said means being positioned on each crosswinding head or on the service trolley ( 13 ).  
     
     
         13 . The crosswinding machine according to  claim 12 , characterized in that said movement means of the course of the yarn ( 1 ) consist of an oscillating arm which engages the yarn ( 1 ) on its end, in correspondence with a draft.  
     
     
         14 . The crosswinding machine according to  claim 12 , characterized in that said movement means of the course of the yarn ( 1 ) consist of at least one draft, situated on the back of the suction mouth ( 6 ).  
     
     
         15 . The crosswinding machine according to  claim 14 , characterized in that said means for the collection and positioning of the yarn ( 1 ) consist of two V-shaped drafts, a first draft ( 10 ) near the sucking inlet ( 8 ) of the suction mouth ( 6 ), substantially having the same width as the inlet ( 8 ) of the suction mouth ( 6 ), and a second draft ( 11 ), near the oscillating arm ( 9 ) of the suction mouth ( 6 ).  
     
     
         16 . A suction mouth ( 6 ) of a crosswinding machine, characterized in that it has at least one draft on its back.  
     
     
         17 . The suction mouth ( 6 ) according to  claim 16 , characterized in that it has two drafts on its back, a first draft ( 10 ) near the sucking inlet ( 8 ) of the suction mouth ( 6 ), substantially having the same width as the inlet ( 8 ) of the suction mouth ( 6 ), and a second draft ( 11 ), near the oscillating arm ( 9 ) of the suction mouth ( 6 ).