Shuttle spool with yarn trapping device
AssigneeTexo AB
InventorHans Johansson
Life of this patent
Estimating the term…
Abstract
A shuttle spool and a method for its producing, the spool being for a shuttle in a weaving machine wherein the yarn (thread) is wound onto a pirn which is rotated by rotational devices during the winding. A yarn-trapping device is provided at one end of the pirn, and the pirn with the yarn-trapping device is positioned in the rotational devices. The yarn on the pirn is being wound to form the spool, and after the winding-on of the yarn has been completed, an emerging yarn part is brought into cooperation with the yarn-trapping device for fixing the emerging yarn part.
Claims12
A method for producing a spool for a shuttle in a weaving machine wherein a yarn (thread) is wound onto a pirn which is rotated by rotational means during the winding, said method comprising the steps of:
- a) providing a yarn-trapping device at one end of the pirn;
- b) positioning the pirn with the yarn-trapping device in the rotational means;
- c) winding the yarn on the pirn to form the spool;
- and
- d) after the winding-on of the yarn has been completed, bringing an emerging yarn part into cooperation with the yarn-trapping device for fixing said emerging yarn part, said bringing including positioning said emerging yarn part crosswise in at least a first and a second groove provided on the yarn-trapping device, and bringing the yarn in each groove in a fastening cooperation with walls of said groove forming an upwardly and outwardly widening gap.
A spool arrangement for a shuttle in a weaving machine including a spool provided with a yarn-trapping device, the yarn-trapping device being rotationally mounted on a pirn of said spool before winding of yarn on said spool, means for bringing an emerging part of yarn into cooperation with the yarn-trapping device for fixing said emerging part and means for rotating the yarn-trapping device relative to the pirn, after the full amount of yarn has been applied on the pirn, to retighten any loose final turns of the yarn said yarn-trapping device further comprising bearing members for said rotational means and at least two grooves extending crosswise with respect to each other, wherein each groove is arranged to cooperate mechanically with the respective yarn section via its walls, which form an upwardly and outwardly widening gap, and wherein each groove at both its ends is provided with recesses which facilitate the introduction and removal of the yarn in the groove.
A method for spool exchange in a weaving machine, in which a spool with the yarn-trapping device is applied in a shuttle of the weaving machine and from which a first spool/pirn is removed at the time of the exchange, said method including the steps of:
- 1) providing an exchange initiation signal from at least one of a programmable-controlling unit and a shuttle system of the weaving machine;
- 2) fixing an emerging first yarn part, in trapping members of the yarn-trapping device before, during or after the removal of the first spool/pirn from said shuttle;
- 3) applying a new, second spool provided with yarn-trapping device in said shuttle;
- 4) removing the yarn-trapping device from the second spool pirn by gripping members;
- 5) applying reciprocal movements to the gripping members and shuttle members during which yarn turns are drawn off from the second spool;
- and
- wherein during or after the reciprocal movements, the yarn drawn out from the second spool, defining a second yarn part, is received by said trapping members for the purpose of joining the first and second yarn parts.
A spool for a shuttle in a weaving machine, said spool being provided with a yarn-trapping device, the yarn-trapping device being rotationally mounted on a pirn of said spool before winding of yarn on said spool and means for bringing an emerging part of yarn into cooperation with the yarn-trapping device for fixing said emerging part, after the full amount of yarn has been applied on the pirn, said means comprising at least two grooves extending crosswise with respect to each other on said yarn-trapping device, wherein each groove is arranged to cooperate mechanically with the respective yarn section via its walls, which form an upwardly and outwardly widening gap, and wherein each groove at both its ends is provided with recesses which facilitate the introduction and removal of the yarn in the groove.
Dependencies are inferred from the claim text.