Method and apparatus for forming snarl-free thread reserves

A method for forming a thread reserve between a delivery bobbin and a winding bobbin and for preventing snarl formation in the thread reserve during re-piecing a thread in case of work interruptions or thread rupture of a thread withdrawn from the delivery bobbin while forming a thread balloon at winding machines, doubling machines or the like, comprising the steps of:

• passing the thread from the delivery bobbin through a guide eye arranged above the delivery bobbin to said winding bobbin so as to form a thread balloon limited by the guide eye during the winding operation;
• deflecting said thread at an upper edge of said delivery bobbin such that said thread is prevented from disengaging from an outer surface of the delivery bobbin due to friction at said upper edge in the event tension of the thread slackens;
• and
• reducing the distance between said guide eye and said delivery bobbin in the event of thread rupture or work interruption to such an extent that said thread extending between said upper edge of said delivery bobbin and said guide eye forms an angle of <60.degree. with an end surface of the delivery bobbin.

A method for forming a thread reserve between a delivery bobbin and a winding bobbin and for preventing snarl formation in the thread reserve during re-piecing a thread in case of work interruptions or thread rupture of a thread withdrawn from the delivery bobbin while forming a thread balloon at winding machines, doubling machines or the like, comprising the steps of:

• passing the thread from the delivery bobbin through a guide eye arranged above the delivery bobbin to said winding bobbin so as to form a thread balloon limited by the guide eye during the winding operation;
• deflecting said thread at an upper edge of said delivery bobbin such that said thread is prevented from disengaging from an outer surface of the delivery bobbin due to friction at said upper edge in the event tension of the thread slackens;
• providing an axial extension at the region of said delivery bobbin;
• forming upon said axial extension a thread turn from an end of the thread and which thread turn extends in opposition to the direction of wrap of the thread turns formed on said delivery bobbin;
• and
• forming a loop at said upper edge of said delivery bobbin from said thread turn on the axial extension in order to form a snarl-free thread reserve.

A winding machine or the like comprising:

• a donning mandrel;
• a delivery bobbin mounted on said donning mandrel;
• a winding bobbin for winding-up one or a number of threads running towards the same;
• drive means for driving said winding bobbin;
• a thread guide arranged substantially coaxially with respect to and at a distance from said donning mandrel;
• and
• means for reducing, in the event of a slackening in thread tension, the angle formed by a thread which extends between said delivery bobbin and said thread guide, and an upper edge of said delivery bobbin such that said thread is deflected at said upper edge of said delivery bobbin and thereby is continuously maintained in frictional engagement with said upper edge of said delivery bobbin substantially during the time of the slackening in the thread tension and thus is prevented from disengagement from an outer surface of said delivery bobbin due to said frictional engagement with said upper edge of said delivery bobbin.

A winding machine or the like comprising:

• a donning mandrel;
• a delivery bobbin mounted on said donning mandrel;
• a winding bobbin for winding-up one or a number of threads running towards the same;
• drive means for driving said winding bobbin;
• a thread guide arranged substantially coaxially with respect to and at a distance from said donning mandrel;
• means for reducing the angle of a thread extending between said delivery bobbin and said thread guide;
• and
• said means for reducing said angle comprising structure for enabling lowering of the thread guide towards said delivery bobbin.

A winding machine or the like comprising:

• a donning mandrel;
• a delivery bobbin mounted on said donning mandrel;
• a winding bobbin for winding-up one or a number of threads running towards the same;
• drive means for driving said winding bobbin;
• a thread guide arranged substantially coaxially with respect to and at a distance from said donning mandrel;
• means for reducing the angle of a thread extending between said delivery bobbin and said thread guide;
• and
• said means for reducing the angle comprising structure for raising the delivery bobbin towards said thread guide.

A winding machine or the like comprising:

• a donning mandrel;
• a delivery bobbin mounted on said donning mandrel;
• a winding bobbin for winding-up one or a number of threads running towards the same;
• drive means for driving said winding bobbin;
• a thread guide arranged substantially coaxially with respect to and at a distance from said donning mandrel;
• means for reducing the angle of a thread extending between said delivery bobbin and said thread guide;
• and
• said means for reducing the angle comprising structure for reducing the distance between said thread guide and said delivery bobbin to such an extent that said angle is <60.degree..

A winding machine or the like comprising:

• a donning mandrel;
• a delivery bobbin mounted on said donning mandrel;
• a winding bobbin for winding-up one or a number of threads running towards the same;
• drive means for driving said winding bobbin;
• a thread guide arranged substantially coaxially with respect to and at a distance from said donning mandrel;
• means for reducing the angle of a thread extending between said delivery bobbin and said thread guide;
• a tube provided for the delivery bobbin;
• an extension having an end and forming an axial prolongation attached to said tube of said delivery bobbin;
• and
• said thread being deflectable at said extension so as to form an angle of <60.degree. with an end face of said delivery bobbin.

A method of winding-up a thread on a winding machine, doubling machine or the like comprising a winding bobbin, a delivery bobbin defining an upper edge and a guide eye arranged between the delivery bobbin and the winding bobbin, said method comprising the steps of:

• passing said thread from said delivery bobbin through said guide eye towards said winding bobbin;
• forming, during a normal winding-up operation, a thread balloon between said delivery bobbin and said guide eye and limiting said thread balloon by said guide eye;
• and
• forming, in the event of thread tension slackening, a thread reserve between said delivery bobbin and said winding bobbin by deflecting the thread at said upper edge of said delivery bobbin such that said thread is prevented from disengaging from an outer surface of said delivery bobbin due to friction at said upper edge, in order to prevent snarl formation.