Mettler-toledo Ag

Mettler-toledo Gmbh

Stephan Baltisberger

Hans-Rudolf Burkhard

Andreas Metzger

Thomas Köppel

Peter Schilling

Dominique Genoud

Christophe Béguin

Yves Marmier

Daniel Reber

Urs Loher

Markus Uster

Luzi Hess

Thomas Koeppel

Hans De Waal

Arne Burisch

A parallel guide of a force transmission device has movable and fixed parallel legs, and first and second parallel guiding elements. Thin-point flexional bearings connect the parallel legs to the parallel guiding elements. The movable parallel leg is guided by the parallel guiding element on the fixed parallel leg. A force transmission lever, arranged on the fixed parallel leg, has a lever bearing, and a first lever arm. The force transmission lever is pivotably mounted on the lever bearing and the first lever arm is connected to the movable parallel leg to transmit force. The force-transmitting connection is produced by a coupling element having at least one further thin-point flexional bearing, with at least one functional region of the force transmission device being formed monolithically. A functional region associates at least one bearing point with at least one of the parallel legs, the force transmission lever, and the coupling element.

Monolithic weighing cell with bearings formed by additive manufacturing

A force-measuring device () for a gravimetric measuring instrument has a stationary part () and a load-receiving part (). Parallel guide members () connect the receiving parts. The device also has at least one balance beam () connected to the load-receiving part through a coupling element () acting on a first lever arm () thereof, and which, at a second lever arm () thereof, is connected to a measurement transducer () which is arranged on the stationary part. Further levers () can be arranged, respectively, between the first lever arm and the load-receiving part, and between the second lever arm and the measurement transducer. At least one sliding weight (A,B) is arranged on the at least one balance beam, wherein the position of each of the sliding weights present can be varied in a controlled way by means of at least one drive mechanism.

Force-measuring device with sliding weight

A weighing cell based on the principle of electromagnetic force compensation and having an optoelectronic position sensor that includes a light source, a light receiver, and a shutter vane. The light receiver functions to generate a position sensor signal corresponding to a deflection of the shutter vane from a zero position which occurs as a result of placing a load onto a load receiver of the weighing cell. A controller functions to regulate compensation current in response to the position sensor signal in such a way that the shutter vane and the movable parts of the weighing cell connected to the shutter vane are returned to the zero position by the electromagnetic force between a coil and permanent magnet system of the weighing cell.

Weighing cell based on the principle of electromagnetic force compensation with optoelectronic position sensor

A weighing cell based on the principle of electromagnetic force compensation. A permanent magnet system is mounted on a base part and includes an air gap within which is suspended a coil that is connected to a load receiver through a force-transmitting mechanism. The coil carries an electrical compensation current when the weighing cell is in operation. An optoelectronic position sensor is also included, and its signal corresponds to the deflection of the coil from a zero position which occurs as a result of placing a load on the load receiver. A closed-loop controller regulates the compensation current in response to the sensor signal in such a way that the coil and the load receiver that is connected to it are returned to their zero position by the electromagnetic force that is acting between the coil and the permanent magnet.

A load carrier with a receiving pan for a free-flowing substance, a calibration weight holder for supporting a calibration weight, and a connector element for connecting the load carrier to a load receiver of a weighing cell. The receiving pan is arranged between the connector element and the calibration weight holder and is designed to be loaded with the free-flowing substance through a passage in the calibration weight holder. The calibration weight holder can be loaded with a calibration weight independently of the load status of the receiving pan.

Load carrier

A force-measuring device, particularly a balance, operates on the principle of electromagnetic force-compensation. An electric coilis arranged to be movable in a magnet system. The coil has at least two windings W, Wand a current supply device PB having at least two partial current sources PB, PB, the current sources each assigned to a corresponding winding. A device CU controls and/or regulates the current supplied to the windings by the partial current sources in such a way that, dependent on a force L acting on the force-measuring device, a current I, Iis sent through each of the windings. The sum of the at least two electromagnetic forces which are thereby generated forms the compensation force, while, at the same time, the power dissipated by the coil always takes on a given predetermined value Ptg.

Force-measuring device using electromagnetic force compensation with constant power dissipation

A parallel-guiding mechanism has a vertically movable parallel leg that carries a weighing pan. The movable parallel leg is connected by two essentially horizontal parallel guides to a stationary parallel leg installed in a balance, wherein elastic flexure pivots are formed at the ends of the parallel guides. Incisions that reduce the material strength of the parallel leg in at least one appropriate location define at least one adjustment domain, thus forming a deformation zone which is plastically deformed through application of an adjustment force. In this manner, a corner load error of the parallel-guiding mechanism is corrected.

Adjustable parallel-guiding mechanism, specifically for a gravimetric measuring instrument

In a parallel-guiding mechanism, a stationary parallel leg surrounds a movable parallel leg. The movable parallel leg is connected to the stationary parallel leg and guided in vertical movement by first and second parallel-guiding elements, fastened respectively to the upper and lower end portions. The movable parallel leg can be connected to a load receiver and to a force-measuring cell through a force-transmitting connection in order to transmit the weighing load. Intermediate to, and connecting, the respective end portions is a tilt-adjustment feature, by which the end portions are tilt-adjusted relative to each other about at least one tilt axis to correct a corner load error. The tilt-adjustment feature is provided by at least one of: a pair of bending zones, a spherical joint and a ring-shaped constriction.

Adjustable parallel-guiding mechanism for compact gravimetric measuring instruments

Load cell for a scale

A force-measuring apparatus, particularly a weighing cell, has a stationary part , a load receiver , a measuring transducer , and a lever for transmitting a force from the load receiver to the measuring transducer. An improved arrangement is proposed for changing the lever ratio by providing at least two different locations so that the fulcrum pivot flexures can be attached either at positions and or, alternatively, at positions and of the lever/stationary part.

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Gossau, Switzerland

Stephan Baltisberger