Method and device for the accumulation of a yarn overlength between a bobbin creel and the beam on a beaming machine
AssigneeBenninger AG
InventorsHorst Ulbrich, Martin Fuhr
Life of this patent
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Abstract
After yarn breakage, yarn loops are formed in an accumulator device (3) by rollers (13, 13') that are able to be displaced in relation to each other. The beam is rotated in reverse at a specific reverse speed (c) which is less than the accumulation speed of the accumulator rollers (13, 13'). The length difference arising from the difference between both the speeds is compensated by further withdrawal of yarns (a) from the creel (1) while the yarns are subjected to a defined braking tension of the individual yarn tensioners (7). Complex controls and speed synchronization are thus avoided.
Claims11
Method of accumulating an overlength of yarns between a bobbin creel (1) and the beam (5) of a beaming machine (4), upon cessation in beaming, said method comprising steps of
- deflecting a yarn warp (2) from a beaming position into an accumulation position under the formation of yarn loops by means of accumulator rollers (13, 13') that are displaceable in relation to one another, while rotating the beam (5) in a reverse direction,
- subjecting each yarn to a defined braking tension at the bobbin creel, while maintaining the reverse speed of the beam at less than the accumulation speed of the accumulator rollers so that the length difference arising from the difference between the reverse speed and the accumulation speed is compensated for by further withdrawal of yarns from the bobbin creel under the influence of yarn braking tension.
Device for accumulation of an overlength between a bobbin creel (1) and the beam (5) of a beaming machine (4) in the case of a cessation of beaming, said device comprising
- a machine frame (23) through which the yarn warp (2) can be guided, in each case a lower and an upper group of parallel accumulator rollers (13, 13') being attached to a traction mechanism (12) in such a way that both groups are able to be displaced in opposite directions approximately vertically for the formation of yarn loops, wherein for clamping-free introduction of the yarn warp (2), at least one lead-in guide roller (16) is arranged on the creel side, said lead-in guide roller being movable from a position outside the yarn warp into a mid-position within the yarn warp, the mid-position lying approximately on a plane on which the groups of accumulator rollers (13, 13') cross.
Dependencies are inferred from the claim text.