Patent ID: 6053450
Filing Date: 2000-04-25
Classification: B65H,D01H

Abstract:
A yarn package forming machine for winding a yarn on a bobbin to form a yarn package on said bobbin, comprising:a stationary frame structure;a supporting arm supported on said stationary structure and rotatable around its rock axis;rocking means for rocking said supporting arm around its rock axis;a bobbin holder rotatably supported on said supporting arm with its own rotation axis in parallel relationship with said rock axis of said supporting arm, said bobbin having a rotation axis held in coaxial relationship with said rotation axis of said bobbin holder;a friction roller spaced apart from said bobbin holder and having a rotation axis in parallel with said rotation axis of said bobbin holder, said supporting arm being rockable around its rock axis to have said bobbin holder and said friction roller relatively moved to assume two different operation positions consisting of a winding position where said bobbin is held in frictional contact with said friction roller and driven to rotate by said friction roller to have said yarn wound thereon and a package releasing position where said yarn package is held out of frictional contact with said friction roller to release said yarn package from said bobbin holder;yarn traversing means for traversing said yarn along said axes of said bobbin and said bobbin holder within a traverse width while said yarn is being wound and formed into said yarn package on said bobbin until said yarn is formed into a full yarn package;yarn releasing means for releasing said yarn from said yarn traversing means to form a bunch winding portion on said full yarn package after said yarn is disengaged out of said yarn traversing means;yarn end forming means for forming a yarn end portion including a first trailing yarn end portion trailing to said bunch winding portion to be wound on said full yarn package at a predetermined angle with respect to the axis of said bobbin, and a second trailing yarn end portion to be wound axially outwardly of said yarn package on said bobbin;said yarn end forming means comprising:a yarn transferring member positioned upstream of said bobbin and movable along the axes of said bobbin and said bobbin holder to transfer said yarn axially outwardly of the axial width of said full yarn package to form said yarn end portion on said bobbin after said bunch winding portion is formed on said full yarn package of said bobbin,a yarn retaining unit positioned between said bobbin and the path of said yarn transferring member and operable to have said yarn retained after said yarn end portion is formed on said bobbin, anda yarn cutting unit positioned between the path of said yarn transferring member and said yarn retaining unit and operable to have said yarn cut under the state that said yarn is retained by said yarn retaining unit.