Mettler-toledo Ag

Mettler-toledo Gmbh

Mettler-toldeo Ag

Andreas Metzger

Hans-Rudolf Burkhard

Stephan Baltisberger

Peter Schilling

Thomas Köppel

Jean-Christophe Emery

Dominique Genoud

Yves Marmier

Urs Loher

Markus Uster

Matthias Scheu

Hans-Rudolph Burkhard

Christophe Béguin

Thomas Koeppel

Ernst Tschopp

David Koller

George Fankhauser

Dominic Meyerhans

Marcel Schütz

Arne Burisch

Adrian Birrer

Bruno Lüchinger

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 calibration weight assembly () has at least one calibration weight () and a transfer mechanism, and is used with a gravimetric force-measuring device () having a fixed region (), a load-receiving region (), and a measuring sensor (). The transfer mechanism has at least one poly-stable positioning element (), a first stable state of which defines a calibration position (KP) and a second stable state of which defines a resting position (RP) of the transfer mechanism. The at least one calibration weight can be coupled with the load-receiving region. The transfer mechanism, as actuated by the measuring sensor, transfers the at least one calibration weight from the calibration position to the resting position, or vice versa.

Calibration weight assembly for a gravimetric measuring device

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. 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.

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

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 gravimetric measuring instrument that contains a weighing cell having a load-transmitting member. A load receiver can be coupled to the load-transmitting member through a releasable connection. A mechanical stop resides on the load-transmitting member, and a mechanical counter stop resides on the load receiver. By means of an eccentric bolt engaging the load receiver and the load-transmitting member, the mechanical stop can be pressed against the mechanical counter stop, whereby the stop can be clamped tight against the counter stop. With this arrangement, the load receiver can be rigidly but releasably secured to the load-transmitting member.

Gravimetric measuring instrument with releasable load receiver

Weighing device with at least one weighing cell and with a receiving structure serving to hold the at least one weighing cell, wherein the at least one weighing cell includes a first fastener device serving to fasten the weighing cell in the receiving structure, and the receiving structure includes a second fastener device which is a complementary counterpart of said first fastener device. The fastener devices include a detent engagement mechanism and are designed in such a way that they hold as well as release the weighing cell by means of a form-locking engagement which can be locked and released, respectively, by a simple action in the form of pushing in the direction of the load and pulling against the direction of the load.

Weighing device

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

In a force-transmitting mechanism () with a parallel-guiding mechanism having a stationary () and a movable () parallelogram leg (), with a lever mechanism having at least one lever (), and with at least one coupling element () that introduces a force into the lever mechanism or transfers the force within the lever mechanism, wherein the coupling element is stiff in its lengthwise direction but bends elastically. The coupling element has at least one first flexure joint () with a thin material connection and it is movable in the parallelogram plane. The lever mechanism and each coupling element () are integral parts of a material block. Each coupling element () also has at least two second flexure joints () with thin material connections whose flexibility is in the direction transverse to the bending of the first flexure joint ().

Force-transmitting mechanism for a balance

A weighing modulehas a force-transmitting linkagearranged between the load-receiving portionof the weighing celland the load receiver, with an overload protection device that precisely maintains its position being an integral part of the force-transmitting linkage. By means of a positioning element, the load receiveris positioned without play relative to the load-receiving portionin the plane that extends orthogonal to the load direction, and the load receiveris also guided in the load direction without play. When forces in excess of the pre-tension force of the elastic elementact on the load receiver, the latter has the capability of being displaced in the load direction and to tip in all directions that are orthogonal to the load direction. The housing partserves to delimit at least the range of linear downward deflection as well the tipping movement of the load receiverwhen the load receiveris exposed to transverse forces and to overloads. The rotation constraintis rigidly connected to the load receiverand engages a housing-connected recess. To position the load receiverrelative to its operating environment, a positioning deviceis provided, whose central longitudinal axis coincides with the central longitudinal axis of the load receiver

Weighing module with precisely-positionable overload protection device

A device to weigh substantially uniform weighing objects has a plurality of weighing modules and an equal number of load carriers that have central lengthwise axes extending in the direction of the load. Each of the load carriers is connected, respectively, to one of the weighing modules through a force-transmitting rod, and the load carriers are disposed in a given spatial or two-dimensional arrangement in which the distances between neighboring central lengthwise axes are smaller than the largest lengthwise extension of the respective weighing modules.

Device for weighing substantially uniform weighing objects

A flexure pivot in the form of a thin material connection formed as a result of adjacent material-free spaces is disclosed, as is a force-transfer mechanism for use in a force-measuring device, in particular a balance, containing at least one flexure pivot of the aforementioned type. The force-transfer mechanism has a stationary portion with a lever arrangement comprising at least one reduction lever and serving to transmit a force to a measuring transducer, and it further has at least one coupling element serving to introduce an input force into the lever arrangement, the coupling element being stiff against lengthwise deformation but flexible with regard to bending and having at least one thin material connection. The at least one lever is supported on the stationary portion and/or on a preceding lever by a flexible fulcrum pivot having a thin material connection. At least one thin material connection zone of a thin material connection is delimited by concave-shaped surfaces facing material-free spaces, and at least one of the material-free spaces delimiting the thin material connection zone has a shape that creates a constriction of the thin material connection zone.

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Männedorf, Switzerland

Andreas Metzger