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US 4,232,447 AGranted
Method and an apparatus for continuously monitoring the cross-section of slivers
AssigneeZellweger Uster AG
InventorsWerner Grunder, Erwin Murbach
Life of this patent
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AssigneeZellweger Uster AG
InventorsWerner Grunder, Erwin Murbach
Estimating the term…
In the continuous measurement and control of deviations in cross-section of slivers with constant relative sensitivity which is independent of the adjusted set value with respect to this set value, the sliver is guided between a grooved roller and a feeler roller which contact each other in the absence of the sliver between the grooved roller and the feeler roller. The changes in the position of the feeler roller are converted into rotational movements of a lever shaft and thus into changes of direction of a measuring tab. The measuring tab is arranged eccentrically on the lever shaft. A sensor is movable by means of a lead spindle which is perpendicular to the lever shaft and lies in a plane determined by the lever shaft and by the axis of the feeler roller in the absence of sliver between the rollers. This sensor preferably has a magneto-resistor. The changes in direction of the measuring tab are, therefore, transformed into fault signals of the magneto-resistor, the fault signals being used to control the thickness of the sliver.
An apparatus for continuously monitoring and controlling the deviations in the cross-section of slivers, comprising a grooved roller, a feeler roller which cooperates with the grooved roller, and which is displaceable against a resistance force under the influence of a sliver located between the grooved roller and the feeler roller, a lever shaft on one end of which the feeler roller is eccentrically mounted, an eccentric measuring tab connected to the lever shaft and arranged to reproduce on a larger scale the rotational movements of the shaft, and sensor means including a sensor which lies in a plane determined by the axis of lever shaft and the axis of the feeler roller when no sliver is present for detecting the position of the measuring tab with respect to said plane without contact with said measuring tab.
A method of continuously monitoring and controlling the deviations in the cross-section of textile slivers with respect to a preselected set value, using a grooved roller and a feeler roller which cooperates with the grooved roller to pass the sliver therebetween, comprising the steps of displacing the feeler roller under the influence of the cross-section of the sliver against a resistance force, converting changes in the position of the feeler roller into a rotational movement of a lever shaft, effecting proportional movement of a measuring tab in accordance with movement of the lever shaft, detecting deviation of the measuring tab from a selected position representing said preselected set value without contact therewith by means of a sensor, converting said deviations from the set value of the sliver cross-section into proportional electrical error signals, and controlling the cross-section of the sliver in accordance with said error signals to maintain said set value.
Dependencies are inferred from the claim text.