Zellweger Uster, Inc.

Erwin Murbach

Werner Grunder

Jean Peter

Francois Baechler

Apparatus for measuring the thickness of fibre slivers

Device for the determination of the amount of substance or the density of fiber structures, which utilizes the elastic properties of the fiber material. By means of a sphere which is positioned in a conical opening in a duct through which the fibers pass and which presses on the fibers with a part of its surface, a nozzle is throttled, so that the pressure on the nozzle represents a measure for the force on the sphere. This pressure is in a definite relationship to the fiber pressure on the sphere and can be measured with a pressure measuring device and transformed into an electrical signal by means of a normal commercially-available converter. A small groove in the wall of the duct behind the sphere avoids the attachment of fibers between the sphere and the opening.

Device for the determination of the amount of substance or the density

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.

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Werrikon-Uster, Switzerland

Erwin Murbach