Sartorius

Sartorius Ag

Mettler-Toledo Ag

Sartorius-Werke Gmbh (Und Vorm. Gottinger Prazisionswaagenfabrick Gmbh)

Eberhard Stadler

Franz-Josef Melcher

Matthias Eger

Erich Knothe

Gunther Maaz

Eduard Bierich

Christoph Berg

Otto Kuhlmann

Dieter Blawert

Walter Sodler

Eberhard Lubke

Hans-Heinrich Kohne

Veronika Martens

Rainer Exner

Udo Wedeken

Gottfried Nolte

Herbert Engelhardt

A checkweigher with a belt conveyor includes at least two belt conveyor sections which are arranged one behind the other in conveying direction, wherein one of the conveyor sections is a weighing bridge. The individual conveyor sections include a plurality of conveying belts which travel on a sliding surface and are guided around guide rollers at the ends of the conveyor sections. Sliding fingers formed by extensions of the sliding surface are provided adjacent the conveying belts, wherein the sliding fingers substantially bridge the gap between the adjacent conveyor sections.

Checkweigher with a belt conveyor

An electronic balance with a system carrier (1) fixed to the housing, a load receiver (2) with two guide rods (3/4) which function as parallel guide, connect the load receiver to the system carried in a vertically movable manner, with four protruding arms (5, 6) which are fastened to the load receiver (2) and carry supports points (7, 8, 9, 10) for a balance scale on their ends and with a low-travel measured value receiver (14, 15) which is loaded either directly by the force of weight acting on the balance scale or with the interpositioning of a translation lever (11). The protruding arms (5, 6) comprise a central recess (19, 20) in front of their ends (17, 18) so that an upper web (21, 23) and a lower web (22, 24) remain and form a parallel guide for the particular support point (7, 8, 9, 10) of the balance scale. Each of the four support points (7, 8, 9, 10) of the balance scale is associated with a wire strain gauge (27, 28, 29, 30) located on one of the associated webs (21, 23). These four or eight wire strain gauges (27, 28, 29, 30) are arranged in such a manner on the webs (21, 23) that they are all expanded, stressed upon an approximately central loading of the balance scale. These four wire strain gauges (27, 28, 29, 30) are wired to two half bridges and the output signals of the two half bridges are added with presettable values to the output signal of the measured value receiver (14, 15).

Electronic balance with parallel guide and scale on top

An electronic balance with scale on top and with parallel guide rods whereby corner-load errors can be corrected by means of the inclusion of at least one leaf spring which is fastened to a load receiver and is supported on the other end on a fixed point of the housing. The magnitude of the correction can be adapted to the corner-load error of the unadjusted parallel guide by means of the selection of the spring stiffness of the leaf spring and/or by means of its effective length.

Electronic balance with scale on top

In an electronic balance with a scale on top with two guide rods which connect a load receiver to a system carrier fixed to the housing as parallel guide, with at least one translation lever which is connected to the system carrier by means of two springs and with a coupling element (9) which transfers the force corresponding to the mass of the weighed material from the load receiver to the shorter lever arm of the translation lever while the counteracting force imposes on the longer lever arm of the translation lever. The two springs and the coupling element (9) are connected to each other by a common cross piece (8) and consist of a single sheet of metal, whereby the thickness of the sheet of metal is greater than the shorter lever arm of the translation lever and the material thickness is reduced in such a manner both in the area of the two springs and in the area of the coupling element (9) that the shorter lever arm is formed by an offset of the thin area (26) of the coupling element (9) produced in the longitudinal direction of the lever in relation to the thin areas (28) of the springs. The length of the shorter lever arm is determined only by the offset of the thin areas (26, 28) of the coupling element (9) and of the springs within the sheet thickness and can be very precisely manufactured by means of suitable manufacturing methods.

An electronic balance with a weighing scale which is connected via a parallel guide to a system carrier, and with a translation lever which is rotatably mounted on the system carrier and onto the shorter lever arm of which the force of the weight acting on the balance scale is transferred via a coupling element and on the longer arm of which the coil of an electromagnetic compensation of force is fastened, that at least one spring touches the translation lever for the purpose of astatization, the line of application of which spring passes through the point of rotation of the translation lever. This results in a compact design and a good efficiency of astatization. It is advantageous to use a wire or a band and/or a laterally jutting-out projection on the translation lever as spring.

Electronic balance

There is disclosed a balance based on the principle of the electromagnetic compensation of force with a cylindrical permanent magnet system, with a magnet cover and with a coil for generating the counteracting force that an emitter and a receiver of the optical position sensor be housed inside the magnet cover. The slit diaphragm of the optical position sensor, which extends from below into the area between emitter and receiver, then forms a compact unit with a carrier, e.g., the end of a translation lever, and with a coil and mutual shifts at temperature changes and temperature gradients occur only to a minimal extent.

Balance based on the principle of the electromagnetic compensation of

The invention discloses an electronic balance with a scale on top, a balance scale, a balance scale carrier, two identical guide rods (7,8) which connect in an articulated manner the balance scale carrier and the balance scale in the form of a parallel guide to a system carrier (1/5) fixed to the housing and with at least one corner-load adjustment lever (22') which is connected to the system carrier via a thin area (24) and which carries a support point in the vicinity of this thin area (24) for the end of a guide rod (7) on the system carrier that the corner-load adjustment lever (22') is bent at right angles between the support point of the guide rod (7) and the thin area (24) to the system carrier (1,5) in such a manner that the moving joint (17) of the guide rod (7) and this thin area (24) are at the same height. As a result, even great forces in the guide rods such as those which occur at an off-center loading of the balance scale do not cause any torque on the corner-load adjustment lever and thus result in a very stable corner-load adjustment.

Electronic balance with scale on top and corner-load adjustment

In a parallel rod guide for electronic balances having a measured value sensor, typically corner load adjustments are made by adjusting the parallelism of the two rods and such adjustments are normally sufficient. However, this can eliminate only linearly load-dependent corner load errors. In order to eliminate corner load errors which are non-linearly dependent on the load, the present invention provides an adjustment assembly which varies the resilience of the fastening points on the system carrier side of at least one rod to horizontal forces. The adjustment assembly may comprise, a screw/nut connection whose position can be varied vertically therewith, varying the effective length of a resilient intermediate part.

Electronic balance having parallel rod guides and having a scale on top

In a spring body which is manufactured from a cubical piece, intended for a balance with an upper scale, divided into an upper and a lower guide bar by a horizontal opening extending all the way through it so that the spring body also forms the parallel guide for the balance scale, and which has wire strain gauges at thin spots in the areas of at least one guide bar the width of the spring body is divided at least in the area of the guide bars into two partial areas by a vertical opening which extends all the way through it and does not contact the edge. The vertical opening can have various shapes. The wide spring body has the advantages of in sensitivity to errors caused by off center loading and allowing the scale to be connected to the parallel-guided part of the spring body at two or three points, which reduces the stability requirements of the scale. The strain gauge are advantageously distributed so that one half of them is on each of the two areas of spring body. The strain gauges can be applied in various configurations.

Spring body with integrated parallel guide for a balance with an upper

An electric inclination meter is built into a high-resolution electric balance with a measured value receiver, a microprocessor for digital signal processing and with a digital display. This inclination meter compensates the inclination-dependent errors of the balance. The inclination meter can have a movable suspended mass or it can have a container which is partially filled with liquid, thus forming a gas bubble. The positional deviation of the movable elements can be picked up optically or inductively.

Electric balance

An electronic weighing apparatus having a load pan, a load receiver forming part of a parallel construction and supporting the pan, weight compensating means, and at least one force-transmitting lever having a short arm and a longer arm, connected at its short arm to take up the force transmitted by the load pan, and connected at its longer arm with the weight compensating means, wherein a built-in calibrating device includes a calibrating lever having an arm connected via a coupling element in force transmitting relation with the load receiver such that the force-transmitting connection can be selectively established or broken.

Electronic weighing apparatus with calibrating device

An electromagnetically compensating measuring apparatus, as in force measuring or weighing devices, wherein a compensation coil is wound upon a coil form movable in the air gap of a stationary permanent magnet system having a pole plate, a capacitive position sensor is connected to detect the position of the compensation coil, and an automatic volume control amplifier is series-connected to the position sensor so as to follow it, with the output of the amplifier connected to feed the compensation coil to tend to hold it in a predetermined zero position, and wherein the coil form and the pole plate each form an electrode of the position sensor.

Measuring apparatus with electromagnetic force compensation and

A parallel construction, particularly for a top-loading balance with elecmagnetic force compensation, has two essentially identical, preferably trapezoidal, movable guides in parallel horizontal planes. The guides are mounted permanently at one end and connected together by a movable rigid connecting element at the other end. The two guides are displaced relative to one another in their planes at right angles to their axis of rotation.

Growing community of inventors

Gottingen, Germany

Eberhard Stadler