Zellweger Luwa Ag

Zellweger Uster Ag

Francois Baechler

Isidor Harzenmoser

Klaus Strehler

Jurg Zehr

Hansjorg Rutz

Ju/ Rg Zehr

The invention relates to a method and device for detecting the mass of fiber material (5) which is processed in a rotor spinning machine to form yarn. In order to obtain a measurement signal which is a function of the mass of fiber material and which can also be used for controlling or monitoring a spinning station without requiring an independent measuring device, this measurement signal is detected in the spinning station of a rotor spinning machine on the feed trough (1) thereof.

Method and apparatus for detecting the mass of fiber material in a

A device for measuring the mass of fiber slivers contains an entry part for the fiber sliver to be measured and a measuring part adjoining the entry part. Arranged on the measuring part are two measuring members working on different measurement principles, specifically a so-called fiber-sliver mechanically, and so-called active-pneumatic measuring member for measuring the pneumatic pressure generated by the fiber sliver at a contraction. In addition to measuring the mass of fiber slivers, the device can be used for obtaining a characteristic variable for their composition or for separate regulation and monitoring in a control stage.

Device for measuring the mass of fiber slivers

Method of measuring the mass of fiber slivers

Method and device for regulating the draw of a drawing unit

In a textile fiber preparation machine, thickness and/or unevenness characteristics of a lap (W) formed by a web or wadding of textile fibers being fed in the machine are determined for individual longitudinal strips spaced across the width of the lap. A plurality of individual sensors (2) are arranged next to one another over the width of the lap (W) and press the lap (W) against a stationary guide (4,5, 6--6'). Each of the sensors (2) is movable toward and away from the guide and is resiliently biased toward the guide. The amount of movement of an individual sensor (2) away from the guide by the lap is a measure of the thickness of the lap portion being contacted by that sensor. The use of individual sensors arranged end to end across the width of the lap improves sensitivity so that even brief changes in thickness when the lap has a high transport speed can be measured reliably. Furthermore, the apparatus can be adapted quickly and simply to changing lap widths.

Device for measuring the thickness and/or unevenness of webs or wadding

A sliver measuring device includes a pair of rollers (6, 7) which limit two sides of a rectangular measuring space (3). A third side of the measuring space (3) is closed off by a guide roller (8) or by a guide plate. A measuring element (5) for the thickness or non-uniformity of the sliver is arranged on a fourth side of the measuring space. The rollers (6, 7) serve to compact the sliver in the measuring space. The measuring element (5) is formed by a leaf spring provided with strain gauges. Since the sliver is actively driven at the measuring point, this leads to an increase in the compaction of the sliver and thus to an increase in the measuring accuracy dependent upon the compaction. On the other hand, the inertia of the measuring element is very low.

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Wermatswil, Switzerland

Francois Baechler