A yarn winder, a method for producing a yarn package and a motor

Abstract

A motor, characterized in that a balance-correcting portion is provided within a range of ±L/3 in the axial direction from the center of the overall length in the axial direction of the rotor of the motor, where L denotes the overall length; a yarn winder provided with the motor; and a yarn package production method using the yarn winder. A long spindle capable of rotating at a high speed is used to allow yarns to be wound at a high speed in a large amount, thereby improving the productivity of yarn packages.

1 . A yarn winder comprises a bobbin holder to be mounted with bobbins, a spindle for rotating said bobbin holder and a motor for rotating said spindle, wherein a balance-correcting portion is provided within a range of ±L/3 in the axial direction from the center of the overall length in the axial direction of a rotor of said motor, where L denotes the overall length.  
     
     
         2 . A yarn winder comprises a bobbin holder to be mounted with bobbins, a touch roller for giving a face pressure to yarn packages formed around said bobbins and a motor for rotating said touch roller, wherein a balance-correcting portion is provided within a range of ±L/3 in the axial direction from the center of the overall length in the axial direction of a rotor of said motor, where L denotes the overall length.  
     
     
         3 . The yarn winder according to  claim 1  or  2 , wherein said rotor is split into plural rotor members in the axial direction on the overall length.  
     
     
         4 . The yarn winder according to  claim 3 , wherein said balance-correcting portion is provided between said plural rotor members.  
     
     
         5 . The yarn winder according to any one of claims  1  through  4 , wherein said motor is an induction motor.  
     
     
         6 . A method for producing a yarn package comprising the steps of mounting bobbins on the bobbin holder of the yarn winder defined in any one of claims  1  through  5 , rotating a rotational driving shaft by the motor, winding a running yarn coming from a yarn supply source on the bobbins rotated by rotation of the driving shaft, and forming a yarn package on each of the bobbins.  
     
     
         7 . The method for producing a yarn package according to  claim 6 , wherein a running speed of the running yarn is not less than 7,000 m/min.  
     
     
         8 . A motor comprises a stator, a rotor and a motor shaft mounted with the rotor, wherein a balance-correcting portion is provided within a range of ±L/3 in the axial direction from the center of the overall length in the axial direction of said rotor of said motor, where L denotes the overall length.  
     
     
         9 . The motor according to  claim 8 , wherein said rotor is split into plural rotor members in the axial direction on the overall length.  
     
     
         10 . The motor according to  claim 9 , wherein said balance correcting portion is provided between said plural rotor members.  
     
     
         11 . The motor according to any one of claims  8  through  10 , wherein said motor is an induction motor.