US 6,629,660 B1 · Take-up method and device for synthetic fiber and method of using thread package

Abstract

A method and apparatus for winding synthetic fibers is disclosed. According to the invention, a yarn is wound around a bobbin without winding a tail bunch, at a high successful bobbin-to-bobbin yarn transfer rate for a variety of yarn properties, i.e. different in thickness, lubricant used, etc., while inhibiting the loosening of the yarn tail into single fibers and stably and easily forming a proper yarn tail length. Tail bunch removing work is not required and the winding process is stabilized. A yarn is wound around an empty bobbin using a yarn winding apparatus composed of a traverse fulcrum guide, a traverse device, a contact pressure roller, two spindles, a moving device for moving the spindles, and a yarn transfer device for introducing the yarn into a yarn holding portion for holding the yarn. The yarn transfer device is composed of an upper yarn passage guide, a lower yarn passage guide, and a surface bunching guide respectively provided at positions upstream and downstream of the empty bobbin in the yarn running direction. The yarn is moved outside the traverse width, to be kept almost parallel to the yarn holding portion by the upper yarn passage guide and the lower yarn passage guide, pressed to the empty bobbin by at least either of the guides, moved to the yarn holding portion by at least either of the guides, and held and cut by the yarn holding portion the holding point of the yarn is allowed to move in the rotating direction of the empty bobbin reverse to the running direction of the yarn. The yarn is allowed to be automatically disengaged from the upper yarn guide, and is moved toward the center of the traverse without forming the initially straight-wound yarn tail bunch, and that when the yarn is engaged with the traverse guide, regular winding is started.

Claims30

Dependent claims

A method for winding a yarn in which the yarn is wound around an empty bobbin with a yarn winding apparatus comprising a traverse fulcrum guide for winding the yarn, a traverse device for traversing the yarn through a regular traverse area before winding, a contact pressure roller for providing a predetermined face pressure to the wound yarn in contact therewith, two spindles alternately displaced between a winding side and a stand by side for winding the traversed yarn, a moving device which moves the spindles to continuously transfer the yarn from the spindle on the winding side to the spindle on the standby side, and a yarn transfer device to introduce the yarn into a yarn holding portion of an empty bobbin on the winding side spindle to hold the yarn, wherein said yarn transfer device comprises an upper yarn transfer mechanism provided upstream of the empty bobbin mounted around the spindle on the winding side, a lower yarn transfer mechanism provided downstream of the empty bobbin, and a yarn passage control mechanism to control passage of the yarn extending to a wound yarn package moved to the standby side, comprising:

shifting the yarn outside the regular traverse area with a yarn shift guide of the upper yarn transfer mechanism;
maintaining the yarn at a stationary yarn keep guide;
returning the yarn shift guide to its original position;
moving the yarn to a yarn holding portion of the empty bobbin for almost parallel introduction by the lower yarn transfer mechanism;
holding the yarn at the holding portion of the empty bobbin;
moving the yarn at the holding portion in a rotating direction of the empty bobbin reverse to a running direction of the yarn;
automatically disengaging the yarn from the stationary yarn keep guide of the upper yarn transfer mechanism;
moving the yarn toward a center portion of the regular traverse area without forming an initially straight-wound yarn tail bunch;
and
starting regular winding when the yarn is engaged with the traverse guide.

7 more elements

A yarn winding apparatus in which a yarn is wound around an empty bobbin comprising:

a) a traverse fulcrum guide for winding the yarn;
b) a traverse device for traversing the yarn before winding the yarn;
c) a contact pressure roller to produce a predetermined face pressure to the wound yarn in contact therewith;
d) two spindles alternately used for winding traversed yarn;
e) a moving device which moves the spindles to continuously transfer the yarn from the spindle on a winding side to the spindle on a standby side;
and
f) a yarn transfer device to introduce the yarn into a yarn holding portion for holding the yarn, wherein said yarn transfer device comprises:
i) an upper yarn transfer mechanism provided upstream of the empty bobbin mounted around the spindle on the winding side;
ii) a lower yarn transfer mechanism provided downstream of the empty bobbin;
and
iii) a yarn passage control mechanism to control passage of the yarn extending to the wound yarn package moved to the standby side;
wherein the yarn winding apparatus is provided with a resistance guide which contacts the yarn to produce a frictional resistance when the yarn is moved toward the center of the regular traverse area, wherein the yarn is moved outside the regular traverse area by a yarn shift guide of the upper yarn transfer mechanism to be kept at a stationary yarn keep guide of the upper yarn transfer mechanism, and returning the yarn shift guide to its original position, and moved to a yarn holding portion of the empty bobbin for almost parallel introduction by the lower yarn transfer mechanism, to be held and cut by the yarn holding portion such that 1) the holding point of the yarn is allowed to move in a rotating direction of the empty bobbin reverse to a running direction of the yarn, 2) the yarn is allowed to be automatically disengaged from the stationary yarn keep guide and is moved toward the center of the regular traverse area without forming an initially straight-wound yarn tail bunch and comes into contact with the resistance guide, to be lowered in moving speed, and while a yarn tail is formed, and 3) when the yarn is engaged with the traverse guide, regular winding is started.

9 more elements

Dependencies are inferred from the claim text.

Take-up method and device for synthetic fiber and method of using thread package

Life of this patent

Take-up method and device for synthetic fiber and method of using thread package

Life of this patent

Abstract

Claims30