Sartorius

Sartorius Ag

Sartorius-Werke Gmbh

Sartorius-Werke Gmbh (Und Vorm. Gottinger Prazisions-Waagenfabrik Gmbh)

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

Christoph Berg

Erich Knothe

Franz-Josef Melcher

Christian Oldendorf

Franz J Melcher

Gunther Maaz

Eberhard Stadler

Werner Schulze

Matthias Eger

Eduard Bierich

Franz-Josef Melcher, Deceased

Otto Kuhlmann

Heinz-Gerhard Kohn

Alfred Klauer

Jurgen Ober

Dieter Blawert

Klaus Dardat

Thomas Schink

Hans-Heinrich Kohne

Eberhard Lubke

Guenther Maaz

Michael Muller

Rudolf Koehler

Rolf Michaelis

In an electronic balance for loading having a balance scale () weighing system, display (), control keyboard (to) and a digital processing electronic circuitry in which circuitry at least one memory is present for the weighed value shown in the display (). A first additional key () is present in the control keyboard (to) upon the actuation of the key the weighed value shown in the display () and stored in the digital signal processing electronics is decreased and upon the first actuation of the key the weighed value displayed immediately previously is taken in addition into a first additional memory. Furthermore, a second additional key () is present in the control keyboard (to) upon whose actuation the weighed value displayed in the display () is taken into a second additional memory. By means of the decreasing key the balance operator can decreased the display from the too large actual value step-by-step to the correct theoretical value. Since the overload is generally only a few numerical steps of the balance display, this is achieved with a few steps. The balance can calculate the percentage overload by storing the balance display prior to the decreasing and during the conclusion of the decreasing and subsequently bring about the same overloading in the known manner for each of the remaining components. This creates the possibility even for simple loading balances without an electronic recipe memory of compensating an inadvertent overloading of a component by means of a overloading of the other components in equal percentage.

Electric balance for correcting misloading thereof

Electronic scale including a line power voltage supply ( ); a line switch ( ); and a separate voltage supply ( ), which is independent of the line powered voltage supply ( ) and which supplies at least one clock module ( ) with voltage. The scale has a normal operating state in which all the electronic components are supplied with voltage, a standby operating state in which the essential heat-generating components are switched on while components susceptible to deterioration over time and the display ( ) are switched off and, in addition a further operating state (sleep mode) in which the line switch ( ) is open. After expiry of a prescribed time and/or at a prescribed time of day, the clock module ( ) automatically terminates the further operating state and switches over into the normal operating state or the standby operating state. This makes it possible to lower the energy consumption of the scale, which in the case of conventional electronic scales is scarcely less in the standby operating state than in the normal operating state. Specifically, the sleep mode according to the invention eliminates power consumption of the actual electronic system and also avoids all the power losses in the transformer and in the power supply unit.

Electronic scale having a sleep mode in addition to a standby operating mode

An analog/digital converter including an amplifier (,) wired as an integrator, a comparator (,) electrically downstream from the integrator, a time counter (,) which continually counts the pulses of a pulse generator (,), a bistable element (,), and additional circuitry. The bistable element (,) drives the input network of the amplifier (,) with at least one switch (,) in such a way that in one of its two positions (&ldquo;off&rdquo; condition) a current I,proportional to the analog measured value is integrated, and in the other position (&ldquo;on&rdquo; condition) a constant reference current I,with opposite polarity to the current I,is integrated in addition to current I,. The switching of the bistable element from the &ldquo;off&rdquo; condition to the &ldquo;on&rdquo; condition is controlled by the time counter, and the switching from the &ldquo;on&rdquo; condition to the &ldquo;off&rdquo; condition (switch-off time) is controlled by the output signal of the comparator, which is generally synchronized with the pulses of the pulse generator. The pulses of the pulse generator (,) are summed to a result during the time the bistable element is in its &ldquo;on&rdquo; position. The additional circuitry displaces the switch-off time of the bistable element (,) beyond the time resulting from the above synchronization by a number of pulses of the pulse generator (,) determined by an arithmetic unit (,).

Integrating analog/digital converter

In an electronic balance for loading having a balance scale (3) weighing system, display (19), control keyboard (21 to 26) and a digital processing electronic circuitry in which circuitry at least one memory is present for the weighed value shown in the display (19). A first additional key (25) is present in the control keyboard (21 to 26) upon the actuation of the key the weighed value shown in the display (19) and stored in the digital signal processing electronics is decreased and upon the first actuation of the key the weighed value displayed immediately previously is taken in addition into a first additional memory. Furthermore, a second additional key (24) is present in the control keyboard (21 to 26) upon whose actuation the weighed value displayed in the display (19) is taken into a second additional memory. By means of the decreasing key the balance operator can decreased the display from the too large actual value step-by-step to the correct theortical value. Since the overload is generally only a few numerical steps of the balance display, this is achieved with a few steps. The balance can calculate the percentage overload by storing the balance display prior to the decreasing and during the conclusion of the decreasing and subsequently bring about the same overloading in the known manner for each of the remaining components. This creates the possibility even for simple loading balances without an electronic recipe memory of compensating an inadvertent overloading of a component by means of a overloading of the other components in equal percentage.

In an electronic balance for loading having a balance scale (3), weighing system, display (19), control keyboard (21 to 26) and a digital processing electronic circuitry in which circuitry at least one memory is present for the weighed value shown in the display (19). A first additional key (25) is present in the control keyboard (21 to 26) upon the actuation of the key the weighed value shown in the display (19) and stored in the digital signal processing electronics is decreased and upon the first actuation of the key the weighed value displayed immediately previously is taken in addition into a first additional memory. Furthermore, a second additional key (24) is present in the control keyboard (21 to 26) upon whose actuation the weighed value displayed in the display (19) is taken into a second additional memory. By means of the decreasing key the balance operator can decreased the display from the too large actual value step-by-step to the correct theortical value. Since the overload is generally only a few numerical steps of the balance display, this is achieved with a few steps. The balance can calculate the percentage overload by storing the balance display prior to the decreasing and during the conclusion of the decreasing and subsequently bring about the same overloading in the known manner for each of the remaining components. This creates the possibility even for simple loading balances without an electronic recipe memory of compensating an inadvertent overloading of a component by means of a overloading of the other components in equal percentage.

An electronic balance with a balance scale (3) which is movably connected by a parallel guide consisting of an upper (4) and a lower guide rod (5) in a vertical direction to a system carrier (1) fixed to the housing, with at least two wire strain gauges (15) which are arranged in the vicinity of the ends of a guide rod (4), which ends are on the housing side, and which wire strain gauges measure the horizontal forces in the guide rod (4) which are caused by the torque transferred from the balance scale (3) onto the parallel guide, and with electronics which corrects the weight value emitted from the weighing receiver on the basis of the output signals of the wire strain gauges (15) and from stored comer-load correction factors that at least one of the guide rods (4) is supported on its housing-side end on an intermediate piece (18), that this intermediate piece (18) is connected by at least one approximately vertical thin web (13) and by a horizontal thin web (14) to the system carrier (1) fixed to the housing and that at least one wire strain gauge (15) is fastened to the horizontal thin web (14). This makes it possible to obtain a high output signal from the wire strain gauge in the case of a corner load without the stability of the parallel guide being adversely affected.

Electronic balance with guide-rod parallel guide and wire strain gauge

It is suggested for a balance with one or several weighing cells (1-4, 31) with a total of at least eight wire strain gauges (D.sub.1 -D.sub.4, S.sub.1 -S.sub.4), four of which (D.sub.1 -D.sub.4) are expanded under load and four (S.sub.1 -S.sub.4) compressed under load, in which the eight wire strain gauges are connected together circularly in series so as to form a single Wheatstone bridge which is supplied with voltage along a diagonal (12, 13) (vertical diagonal) and the output signal is taken off along the other diagonal (14, 15) (horizontal diagonal) that a signal is additionally tapped off along the upper horizontal chord (16, 17) and along the lower horizontal chord (18, 19). This makes possible a corner-load adjustment for the balance utilizing the additional signals.

Balance with one or several wire strain gauge weighing cells

Disclosed is a balance with a first parallel guide (3, 3') which resiliently connector a load receiver (2) to an area (5, 5') fixed to the housing and which is resiliently deformed under the influence of the weight to be measured, and with a second, softer parallel guide (8) which is connected by its one end to the load receiver (2) and by its other (11) end via a force receiver which is at least approximately without displacement to the area (5, 5') fixed to the housing and which transfers as a result thereof a fraction of the force of the weight onto the force measuring receiver that both parallel guides (3, 3', 8) exhibit at least approximately the same height and the same length and are arranged close to one another laterally. The second parallel guide is advantageously locate between two partial areas (3, 5, and 3', 5') of the first parallel guide.

Balance with force support

There is disclosed an electric balance with a sensor (2), a digital signal processing unit (4), a digital display (5) and switching means (6) which suppress the leading zeros in the digital display by a control means (7) which activates and deactivates the switching means (6) for suppressing leading zeros as a function of the sign of the result of measuring. In this manner, a change of sign can be signaled more clearly. It is also possible to display more leading zeros as the magnitude of the deviation of the result of measuring from the value zero increases so that the leading zeros appear in several stages, starting from zero up to a set measuring value.

Electric balance with digital display

An electronic balance with a digital display for the exact display of the weighing result, with an quasi analog display for the estimated display of the balance (gross) load, whereby the a quasi analog display consists of at least one horizontal band of activatable points (7), and with a taring operation, that suitable activatable segments (8, 10) be located within, directly above or directly below the first horizontal band of activatable points (7) with which such suitable segments a 'T' symbol (9) can be activated at a plurality of positions along the first horizontal band and that the 'T: symbol be activated during taring at the horizontal position which corresponds to said tare weight on the horizontal band (7) of the quasi analog display while a horizontal bar formed by suitable activation of activatable points indicates gross weight. This makes it possible to display in a simple manner the relative position at which taring was performed. Still other segments (8, 10') can also be used in an advantageous manner as a scale for the quasi analog display.

Electronic balance with quasi analog and digital display

An electronic balance for dosing, with a measured value receiver, a digital signal processing unit, a digital entry keyboard for entering the theoretical value of a dosing, with a theoretical-weight memory and with a digital display unit with several positions after the decimal point, that switching means are present which determine the highest-value decade in which a number in the display is not equal to zero and that these switching means regulate the decoding of the display in such a manner that all zeros to the left of this decade up to the units decade are represented as a small zero 'o' whereas prezeros in the 10 decade, 100 decade, etc. are entirely suppressed in a known manner. This makes possible a quasi-analog representation of the measured value which is attained in the units decade, the 10 decade, the 100 decade, etc. by means of the known suppression of prezeros even in the case of balance displays with positions after the decimal point.

Electronic balance for dosing

In high-resolution electric balances a certain residual temperature coefficient remains even with a good correction of the temperature-dependent errors of the measured value sensor. The invention therefore is with respect to a balance with a built-in calibrating weight (standard) which responds with a new calibration switching in said calibrating weight if a given temperature changes has been exceeded since the last calibration. To this end, the balance comprises in microprocessor digital signal processing unit a separate memory area in which the output signal representing temperature value of a temperature sensor is stored during the calibrating process and also comprises a comparator which upon instruction compares the instantaneous output signal of the temperature sensor which the value stored in this separate memory area. If this difference exceeds a given amount, a signal element indicative of need to recalibrate using the calibrating weight is actuated. In addition, an elapsed time indicator can also be present which also actuates the signal element after the passage of a given time since the last calibration. In an advanced embodiment the apparatus will automatically cause recalibration to physically take place by having the signal processing unit control a motor which will switch the calibrating weight into weighing position. Said automatic recalibration taking place instead of or in addition to actuation of the signal element. Other physical science inputs can also be sensed and utilized by themselves or in combination in determining when recalibration should occur.

Electronic balance with calibrating system

The invention suggests for an electronic balance with a balance scale (1), with a parallel guide for the balance scale (1), with at least one sensor which measures the torques transferred from the balance scale (1) to the parallel guide, with storage means in the electronic circuitry of the balance in which means the magnitude of the corner-load inaccuracies of the parallel guide is stored in the form of corner-load correction factors and with switching means or program parts in the electronic circuitry of the balance which correct the weight value outputted from the measuring system on the basis of the output signals of the sensor or sensors and of the stored corner-load correction factors that controllable signals (10-13) are provided which designate the corners and sides of the balance scale (1). The signals can be formed by light sources adjacent to the balance scale (1) or in the corners or on the sides of the display field (9). The use of individual segments of the 7-segment numbers (3) of the balance display is preferred. An operator control can be achieved with these signals when readjusting the corner-load freedom of the balance.

Electronic balance with electronic corner-load correction

It is necessary, when high requirements are demanded from balances, that the effect of different disturbance variables such as, e.g., temperature and/or moisture on the measuring system be corrected. To this end, temperature and moisture sensors are used from whose output signal correction values are calculated. The invention suggests that a storage area be provided into which the instantaneous measured results of these sensors are stored in succession, where they remain stored for a set time. This data stemming from different times, evaluated with set weighting factors, could then be used to calculate the corrections. This makes it possible to obtain a good correction of changing disturbances even with a different behavior in time of sensors and measuring system.

Electric balance

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.

Growing community of inventors

Gottingen, Germany

Christoph Berg