Abstract: A load sensor includes a scale cell for producing an output signal corresponding to the weight of an article, and a dummy cell, provided near the scale cell, for producing a noise signal output ascribable to floor vibration. A correcting circuit extracts a signal proportional to a DC component contained in the output signal of the scale cell and, on the basis of the extracted signal, corrects the output signal of the dummy cell to the noise level of a floor vibration component of the scale cell. The corrected dummy cell noise signal is added in opposite-phase relation to the scale cell output signal, so that the floor vibration noise contained in the scale cell output signal is cancelled out by the corrected noise signal of the dummy cell.

Abstract: An apparatus for measuring a weight including a tuning fork vibrator to produce an oscillation signal having a frequency determined in accordance with a weight applied to the vibrator, a circuit for detecting an abnormal increase in an amplitude of the oscillation signal due to disturbing vibration to produce an abnormal signal, a frequency counter for counting the number of waves of the oscillation signal except for a period during which the abnormal signal is generated and a data processor for resetting the frequency counter each time the frequency counter has counted waves of the oscillation signal for a predetermined period and calculating a measured weight from a count value of the frequency counter.

Abstract: A weighing system, including a plurality of conveyer-type continuous weighing machines each having an analog weighing unit and a digital measurement processing unit, and a single common analog-to-digital convertor operated in time division fashion.

Abstract: A weight scale in particular a bath room scale contains strain gauges. To make the scale of simple design while being reliable and precise a single bar has at its ends a load receiving plate and support base. At least two strain gauges are fastened to the bar and are sensitive to bending of the bar. At least one another strain gauge is fastened to the bar, this being sensitive to twisting of the bar.

Abstract: The invention of this application relates to a weighing machine in which a weighing member such as a weighing saucer or hopper holding or accommodating the materials to be weighed is provided on one side of a load cell through a support, and the load cell is supported on the other side thereof on a frame directly or indirectly through an elastic body for absorbing vibrations. The weighing machine is basically constructed so that the load cell is supported on the other side thereof on the frame through a strain generator for allowing damping in the fixed direction and, at the same time, through an anti-vibration damper for improving a damping characteristic, whereby vibrations of the load cell is damped promptly.

Abstract: A weighing cell, in which the weight forces of the load are compensated by deformation or electromechanical forces, includes a load carrier which receives the load, a mechanical-electrical load-measuring cell, and an acceleration meter which experiences the same vertical accelerations as the weighing cell. The load cell and the acceleration meter are connected electrically with one another such that the measuring signal which is adulterated by the acceleration action is corrected correspondingly. The load cell has an output signal (A+a) comprising a weighing signal (A) superposed by a spurious signal (a) due to such acceleration. A subtractor receives the output signal (A+a). The output signal of the acceleration meter is balanced to a value (a').

Abstract: An electronic balance which displays a correct weight value by averaging the digitized weight data outputted at predetermined time intervals from a weight detector provided in the balance. The weight data averaging to give a correct value is carried out with the number of the basis data for averaging increased each time a new weight data is obtained, after the weight data, which are largely fluctuating in the beginning, have been considered to be stabilized by being settled down in a predetermined limit. In case the once stabilized weight data are brought back into a fluctuating state owing to any external disturbance, such fluctuation is detected and the again unstabilized weight data are excluded from the averaging to give a correct weight value.

Abstract: A link of controllable resistance comprising an FET (Q16) connected in series with a low-value resistor (R15) is connected in parallel with a time constant determining resistance (R11) in an RC type low-pass filter. A discriminator circuit (40, 50, 60) provides an on/off type signal following variations in the DC component of an input signal present on a terminal (A). A retriggerable monostable (80) defines a "neutral" time interval of predetermined duration running from the beginning of said on/off signal. At the end of said neutral period, a circuit (20) switches the FET on, thereby reducing the time constant of the RC network in the RC low-pass filter. This time constant is subsequently progressively rasied to a high value by progressively switching the FET off. The filter is specially applicable to weighing a body that is subjected to movement or to oscillation, or to performing weighing measurements in a vibrating environment.

Abstract: The manual portioning of non-uniform bulk products, such as the bagging of freshly prepared food products in fast-food restaurants, is controlled by a method and means which provide rapid and accurate individual portioning and consistently accurate feedback to the operator. Accurate real time weighing is provided quickly for every portion, and apparatus is disclosed to provide dynamic weighing such that no significant additional time is required for the portioning cycle. Since the feedback to the operator is based on true rather than estimated weight and is presented at the optimum time and location, the operator learns to portion the products accurately, as well as consistently.

Abstract: A device for reducing errors in weighing systems caused by extraneous noise and/or vibration.

Abstract: A method and apparatus for determining a representative average weight reading is disclosed, based on a series of weight readings from a scale subject to vibrations. Signals are generated at regular intervals, representative of the weight readings from said scale. Each new weight signal is compared with the previous weight signal, and one of two alternative labels is assigned to each new weight signal according to whether it is greater or less than the previous weight signal, and the opposite of the previous label is assigned if the signals are equal. The weight signals occurring in a weight averaging interval, which extends from a label change in one direction to the next label change in the same direction, are then averaged.

Abstract: A weighing balance to provide an average weight to an object which tends to move while being weighed such as a laboratory animal. The object to be weighed is placed on a receiving pan which provides an electrical analog output signal corresponding to the weight of the object. This signal after passing through an amplifier is converted to a digital electrical signal fed to a data input control means. A level detector setting means allows an output from said control means only when the weight on the balance reaches a predetermined level. The output from the control means is fed to a memory having a plurality of registers which store this information. Coupled on one side to this memory is a comparator which is also coupled on a second side to said control means. Also coupled to said comparator means is an allowable range means, sampling time means, and average calculating means. The average calculating means feeds an output to a printer.

Abstract: A bidirectional power line filter provides distributive capacitance to accomplish filtering is electrically connected between the power lines and the ground wire in a power distribution system. In addition to lumped parameter or fixed value capacitors, a distributive capacitance is provided by use of a printed circuit board upon which the electrical components forming the filter are mounted. A specially formed dual inductor is wound as a common-core inductor using two toroidal cores preferably formed of ferrite each having a different permeability verus frequency curve. The inventive filter is intended for use in a three-phase Y-connected power distribution system, as well as in a conventional single-phase system. An additional multiple outlet system may be added to the bidirectional filter and it is also formed having distributive capacitance by employing a length of printed circuit board material to which the plurality of outlets are connected.

Abstract: Disclosed herein is an automatically controlled weigh feeding apparatus including a container for prefilling with a substance, a device for discharging the substance from the container at a controllable rate, apparatus for weighing the substance being discharged and for producing an electrical signal proportional to that weight, a voltage to frequency converter connected to receive the electrical signals, a digital computer, apparatus coupled to an output of the voltage to frequency converter for inputting data signals to the digital computer, the computer being adapted to compute a corrective signal based on the input data signals received, and coupling apparatus coupled between the computer and the device for discharging the substance from the container for controlling the rate of discharge responsive to the corrective signal.

Abstract: A stabilization of the zero point of a digital display in a periodically operating weighing scale is accomplished by obtaining the difference between the then-present weight signal S and a stored reference signal, for example the tare value. Resulting differences less than a predetermined threshold value are stored. If the next following difference signal is again smaller than the threshold value and has the same sign, the reference value is corrected by the stored difference. If the signs are different, the tare or reference value remains the same and the value of the stored difference signal is changed to the newly-generated value.

Abstract: When the difference between the weight proportional signal and the tare value is less than a predetermined threshold value, it is assumed that the zero point is changing. Main difference signals less than the threshold signal are stored and subsequently generated ones algebraically added to the first one. The so-created cumulative difference signal is compared to a predetermined limiting value. When it exceeds the limiting value the cumulative difference signal is divided by the number of differences which together created the cumulative difference signal. The so-formed average difference signal is added to the tare value prior to generation of the next main difference signal.

Abstract: To achieve an automatic stabilization of the zero point in a scale having a digital display, any difference between the load proportional signal and the stored reference signal (for example, the tare value) is compared to a threshold value. Differences which are less than the threshold value are halved in a divider. The halved difference signal is then used when the next subsequent one of the load proportional signal is compared to the reference signal, preferably by algebraic addition of the halved difference signal to the reference signal.

Abstract: A magnetic coupling between the sample support shaft and the internal weighing mechanism of a weighing balance assembly is provided which permits transverse movement of the shaft when it or a sample supported by it are bumped or jarred. Generally, the internal weighing mechanism of a weighing balance is quite sensitive to the unavoidable bumping and jarring which occurs during the loading and unloading of a sample. Because the magnetic coupling permits movement of the shaft, no damaging forces or torques are transmitted to the weighing mechanism. The magnetic attraction between the shaft and coupling is sufficient to insure that the shaft remains in an upright position during normal operation.

Abstract: Two-phase logic signals from a reversible shaft encoder or like device provide count occurrence pulses and a count direction logic signal to control incrementing and decrementing of a counting means. One count occurrence pulse is omitted each time the count direction changes to avoid errors which otherwise might result. Up counts and down counts occur at the same shaft encoder positions, and the system has high noise immunity.

Abstract: A high speed weighing machine, for determining the weight of a package "on-the-fly", with respect to a predetermined weight range, as the package travels across a weigh cell weighing platter, incorporates apparatus for interpreting multiple samplings of the weight bearing on the weighing platter for determining the interval during which the package is fully on this weighing platter and for calculating the average weight registered by the weighing platter during that interval wherein three periods are defined for each weighing operation.

Abstract: Method and scale are designed for the manual or automatic weighing of objects of the same nominal weight by means of a scale locked over its measuring system, having a computing device for establishing the weight of the goods to be weighed from the digital output signals of mechanical-electrical converters, e.g. from pre-tensioned measuring strings loaded by the weight of said goods, in which if the load on the measuring system is lower or higher than predetermined limits of the load corresponding to said nominal weight, an electromagnetically generated force acts upon the load support of the scale and prevents the overshooting of said pre-determined load limits.

Abstract: Weighing equipment for weighing a load which is included in a mechanical system with a natural frequency of oscillation which depends on the size of the load, for example in a crane, includes a transducer influenced by the load and which delivers a signal corresponding to the weight of the load. The equipment includes a tunable band exclusion filter connected to the transducer for filtering the signal, in which the signal influences the tuning of the filter so that its anti-resonance frequency follows said natural frequency of the oscillation.

Abstract: A method of producing signals for a damping control of an electric measurvalue indicator, especially an electromagnetic precision balance, having an active filter or impedance transformer located in a branch which filters out the a.c. voltage is disclosed. Transient signals in the form of a.c. voltages with different frequencies are applied to the output of the active filter or transformer in the noise range. Sequentially tapped values of the a.c. voltages are compared in the noise range with previous values. A circuit for producing signals for a damping control of an electric measured-value indicator includes a comparator connected with the low ohmage output of a filter or impedance transformer. The comparator is provided with a switchable voltage storage device to which a differentiating element and an amplifier are connected. When a.c.

Abstract: An electronic weighing apparatus, comprising a scale mechanism having a weighing plate for placing an article being weighed, a movable slit plate associated with the weight of said article on said weighing plate and having a series of slits equally spaced in the moving direction, a light source provided at one side of said slit plate, a photodetector provided at the other side of said slit plate opposite to said light source, whereby a pulse train is generated from said photodetector. The number of pulses in the pulse train is associated with the movement of the slit plate and thus with the weight of said article. A counter for counting the number of pulses of said pulse train for providing a weight value signal, a display register for storing the weight value signal, and a display responsive to the register for displaying the weight value in said register are employed.

Abstract: Weighing apparatus of the electromagnetic load compensation type is disclosed including zero-position detector means for generating a position signal that is a function of the extent to which a loaded weighing pan or the like is displaced from its no-load position, and regulating means responsive to said position signal for generating a compensating current for displacing the weighing pan toward its no-load position, characterized by the provision of filter means connected between the zero-position detector and the regulating means for suppressing the undesired extraneous interference acceleration signals produced, for example, by external shock or vibration forces imparted to the weighing apparatus. In one embodiment, the filter electrical components are constant, and in a second embodiment, means are provided for varying the electrical characteristics of at least some of the filter components as a function of the load applied to the weighing pan.

Abstract: Weighing apparatus of the return-to-zero load compensation type is disclosed, characterized by the provision of voltage-responsive impedance means for modifying the pan position sensing signal to remove undesirable variations therein produced by interference or external vibrations or excessive swinging of the weighing pan by the load. In one embodiment, a dampening circuit is connected between the pan position sensing circuit and the control signal generating means for dampening sensing signals having an amplitude less than a given limit amplitude. In a second embodiment, the voltage-responsive means serves to render inoperable the differential section of a proportional-differential-integral controller when the pan position sensing signals are less than a given limit amplitude. In both embodiments, the voltage-responsive impedance means comprises a pair of diodes connected in polarity opposition in parallel in the corresponding signal-modifying circuit.

Abstract: An electromagnetic weighing balance includes a load support system for supporting the mass to be weighed and including an electromagnetic balance coil disposed in a magnetic field and fed with a balance current producing on the support system a force balancing the weight. The magnitude of the current is taken as a measure of the weight. In order to reduce the effect of vibration the balance coil is fed from a high-impedance source and the balance circuit controlling the balance current in response to displacement of the support system from a datum position includes threshold means increasing the high-frequency gain in response to displacements in excess of threshold levels.

Abstract: Disclosed herein is an automatically controlled weigh feeding apparatus including a container for prefilling with a substance, a device for discharging the substance from the container at a controllable rate, apparatus for weighing the substance being discharged and for producing an electrical signal proportional to that weight, a voltage to frequency converter connected to receive the electrical signals, a digital computer, apparatus coupled to an output of the voltage to frequency converter for inputting data signals to the digital computer, the computer being adapted to compute a corrective signal based on the input data signals received, and coupling apparatus coupled between the computer and the device for discharging the substance from the container for controlling the rate of discharge responsive to the corrective signal.

Abstract: Disclosed herein is an automatically controlled weigh feeding apparatus including a container for prefilling with a substance, a device for discharging the substance from the container at a controllable rate, apparatus for weighing the substance being discharged and for producing an electrical signal proportional to that weight, a voltage to frequency converter connected to receive the electrical signals, a digital computer, apparatus coupled to an output of the voltage to frequency converter for inputting data signals to the digital computer, the computer being adapted to compute a corrective signal based on the input data signals received, and coupling apparatus coupled between the computer and the device for discharging the substance from the container for controlling the rate of discharge responsive to the corrective signal.