Mettler-toledo Ag

Mettler-toldeo Ag

Thomas Koeppel

Peter Schilling

Dominique Genoud

Matthias Scheu

Hans-Rudolf Burkhard

Andreas Metzger

Jean-Christophe Emery

Stephan Baltisberger

A calibration weight arrangement () for an electronic balance with a force-transmitting mechanism () has a calibration weight () adapted to be coupled to the force-transmitting mechanism. The arrangement also has a transfer mechanism and a drive source to manipulate the calibration weight in a guided movement. The drive source includes an actuator () cooperating with the transfer mechanism and at least one piezoelectric element () which drives the movement of the actuator. The piezoelectric element interacts with a drive wheel () that is centrally positioned relative to the calibration weight arrangement and drives a likewise centrally positioned shaft (). The interaction between the piezoelectric element and the drive wheel occurs during the advance movement in one direction through the repeated engagement and release of a frictional contact force.

Calibration weight arrangement for an electronic balance

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 force-measuring cell is designed for a receiving structure having multiple force-measuring cells of the same type. Each cell in the receiving structure occupies a design space whose dimensions, projected into a plane orthogonal to the load direction, is delimited by the design spaces of neighboring and/or is equal to the largest dimension of the cell in the plane. The cell has parallel-guiding diaphragms arranged on upper and lower surfaces thereof. The cell includes a calibration weight arrangement with a calibration weight which can be coupled to the cell, as well as a drive mechanism and a transfer mechanism for guidedly moving the calibration weight. An actuator works together with the transfer mechanism and a piezoelectric element that drives the actuator. The actuator has at least two interacting elements to repeatedly engage and release each other by frictional contact force which occurs during the travel movement in one direction.

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Oetwil am See, Switzerland

Thomas Koeppel