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US 7,475,709 B2Granted
Yarn feeding device
AssigneeIropa AG
InventorsBjorn Halvarsson, Patrik Magnusson, Anders Svanstrom
Life of this patent
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AssigneeIropa AG
InventorsBjorn Halvarsson, Patrik Magnusson, Anders Svanstrom
Estimating the term…
The invention relates to a method for inserting weft yarn material, comprising an insertion system in a loom. According to the invention, for every insertion the insertion system (A) is supplied with a substantial part of the weft yarn required for the insertion in a loose and substantially tension-free manner so as to be intermittently pulled off. A tubular package of adjacent windings is produced from the weft yarn material on an inner mechanical support (S) by way of an at least substantially continuous winding process and is conveyed forward in withdrawal direction. For an insertion, a number of windings that corresponds at least approximately to the weft yarn section intended to be inserted is detached or set free from the support while maintaining its tubular configuration without yarn tension. The weft yarn material is withdrawn directly inwardly from the frontmost winding and then further along the tube axis (X).
A yarn feeding device for a weaving machine including at least one winding element being rotatably driven in relation to a stationary, substantially drum-shaped support for forming a tubular yarn winding package comprising adjacently lying windings of substantially equal form, the yarn winding package being conveyed forwards in a withdrawal direction on the support, and a mechanical weft yarn length measuring assembly having at least one stop element for co-operation with the support, the stop element being adjustable between an engagement position with an engagement from an outer side into the support and a retracted release position, wherein the stop element is movable in the withdrawal direction relative to the support, wherein a power drive is provided for moving the stop element opposite to the withdrawal direction into a predetermined home position close to the winding element, and wherein the stop element in its engagement position is movable from an end position in the withdrawal direction to a predetermined stop position exclusively by the growing yarn winding package.
Dependencies are inferred from the claim text.