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US 5,343,899 AGranted
Output yarn brake
AssigneeIro AB
InventorsKurt A. G. Jacobsson, Lars-Berno Fredriksson
Life of this patent
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AssigneeIro AB
InventorsKurt A. G. Jacobsson, Lars-Berno Fredriksson
Estimating the term…
An easily movable output brake system forms part of or cooperates with a yarn feeder (13) comprising a spatially fixed body supporting a yarn store, from which body a yarn (11) can be drawn off even at advanced speed through an output channel (10). The system comprises a first member (9) which is arranged in a bearing and which, in the functional operation of the system, by means of a surface clamps the yarn being drawn off against a counterstay member (15). The members (9, 15) are designed to effect a yarn-cleaning function dependent on the yarn rotation upon drawing-off, with simultaneous prevention of considerable accumulation of lint, particles etc., in respect of the members. The mobility of the system is obtained by the selection of the components in question. The mobility gives an instantaneous yield and instantaneous return to the previously exerted braking/tensioning effect of a knot on the passing yarn and/or an instantaneous response to one or more controls for modifying the braking or tensioning force of the system during one and the same drawing-off of yarn (machine cycle).
A yard braking system for use at an output side of a yarn feeding device, the yarn feeding device including a yarn storage surface member and an output surface member, the output surface member guiding a yarn from the storage surface member to an output channel extending coaxially downstream from the output surface member along a longitudinal central axis of the yarn feeding device, the yarn braking system comprising a first clamping member associated with the yarn feeding device and a second clamping member associated with a yarn brake coaxially positioned downstream from the yarn feeding device, the clamping members being relatively movable along the longitudinal axis and having respectively a first clamping surface and a second annular clamping surface associated therewith, the yarn passing in an axial movement outwardly over the first clamping surface and then passing inwardly through the second annular clamping surface before entering the output channel during a withdrawal of the yarn, the yarn braking system further comprising means for urging at least one of the clamping members against the other one of the clamping members to effect a selectable basic yarn clamping force acting on the yarn passing between the clamping surfaces, and means for independently and instantaneously varying the yarn clamping force by relatively movably repositioning at least one of the clamping members during the withdrawal of the yarn from the yarn feeding device.
A yarn braking system for use at an output side of a yarn feeding device, the yarn feeding device including a yarn storage surface member and an output surface member, the output surface member guiding a yarn from the storage surface member to an output channel extending coaxially downstream from the output surface member along a longitudinal central axis of the yarn feeding device, the yarn braking system comprising a first clamping member associated with the yarn feeding device and a second clamping member associated with a yarn brake coaxially positioned downstream from the yarn feeding device, the clamping members being relatively movable along the longitudinal axis and having respectively a first clamping surface and a second annular clamping surface associated therewith, the yarn passing in an axial movement outwardly over the first clamping surface and then passing inwardly through the second annular clamping surface before entering the output channel during a withdrawal of the yarn, the yarn braking system further comprising means for urging the second clamping member against the first clamping member to effect a selectable basic yarn clamping force acting on the yarn passing between the clamping surfaces, the urging means including a spring member adjacently provided at a downstream side of the second clamping surface which urges the second clamping member against the first clamping member, and an adjusting means for selectably varying the clamping force generated by the spring member.
Dependencies are inferred from the claim text.