Abstract: A method of packaging fluent solid materials such as coffee includes determining the gross weight of filled packets and determining the tare allowance of the packets. The tare allowance is determined through random sampling and that value is subtracted from the gross weight of the filled packets in order to define a nominal value. That nominal value is then fed to the filling machine in a closed control loop. The apparatus for packaging fluent solid materials includes a bag forming machine, a filling machine for filling the bags, a gross balance for filling the bags and a conveyor for conveying the bags. A switch is provided for filtering out empty bags from the conveyor to a tare balance and a control unit is connected to the measuring outputs of the tare balance. The regulating output of the control unit permits bags to be filtered out and weighted at a defined frequency.

Abstract: The slicing machine, primarily for sliced meats, has a code reader, particularly a bar code reader, available in the vicinity of its goods slicing carriage which reliably determines the goods code for the sliced goods during the slicing process and fetches a programmed price per unit weight from a data memory of a weighing device. The price per unit weight is fed to a processor which determines the price of the goods being weighed or the retail price from the weight measurement. The delivery tray of the slicing machine can be a weighing tray of a weighing device built into the slicing machine. An indicator and/or a charge slip printer can then automatically print the total price that must be paid.

Abstract: A system is provided for controlling the feed rate of material being loaded onto a conveyor train of variable configuration to prevent overloading. The system involves monitoring the power drawn by the various drive motors of the train to establish which is the limiting conveyor under prevailing operating conditions. The instantaneous weight of feed material loaded onto the conveyor train, at its input end, is continuously measured and the current average feed rate is computed from the instantaneous weights measured over a pre-set time interval. A rolling average of the total load to be carried by the limiting conveyor downstream is computed from the average feed rate, taking into account the length of the limiting conveyor. The feed rate is then adjusted in response to the computed rolling average to thereby avoid overloading the limiting conveyor and optimize loading of the conveyor train.

Abstract: Apparatus and method of determining the authenticity of a signal indicative of the mass of an article being weighted. The article is placed upon the platform, and the platform is caused to oscillate and the period of harmonic motion is measured. One of or both the frequency of oscillation and amplitude of the transducer signal is monitored for purposes of determining authentication.

Abstract: A method and an apparatus for calibrating and/or testing of load cells of heavy duty weighing systems use a force transmission device being self-adjustable without friction and having a force transmission ratio in the range of 1:50 to 1:5000 and is adapted to be placed onto a force introduction member. The load cell interposed between said force introduction member and a base may be calibrated by connecting said force transmission device through said force introduction member to said base and by applying varying calibration standards at the force introduction side of the force transmission device.

Abstract: 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).

Abstract: A method and apparatus for automatically measuring the grain fineness, the gypsum content and the limestone content of a cement sample.A first fraction of the sample is loaded by a vibrating hopper into a crucible resting on an automatic scale. This crucible is handled sequentially by tongs on two revolving arms carried on slidable vertical shafts. The circular paths of the arms intersect at a point just above the scale. Motions of the arms and of the tongs are controlled by a programming unit. The weighed sample is poured into a sieve and the weight of oversize grains is automatically related to the sample weight.Gypsum is measured by heating a second fraction of the sample at 1000.degree. C. plus in an oxygen stream, Fe powder being added from a fixed hopper. The crucible is raised into an induction furnace. Released SO.sub.2 is bubbled in a titration cell to which potassium iodate is gradually added by a burette giving an automatic read-out of the SO.sub.3 (gypsum) titration.

Abstract: A weighing apparatus comprises feeder means for temporarily storing an object to be weighed and discharging the object to be weighed as needed, a plurality of weighing hopper means each having a plurality of storage chambers which are integrally coupled, a plurality of weighing means, provided in correspondence with the plurality of weighing hopper means, for independently weighing weights (referred to as partial weights hereinafter) of objects to be weighed, stored in the storage chambers, and a control apparatus for calculating partial weight values of the objects to be weighed based on weighing signals from the weighing means.

Abstract: An apparatus for automatically and accurately measuring ignition loss of powder samples without requirement of manual handling. The apparatus comprises a weighing section, a heating section and a cooling section which are integrally arranged and the weighing section including a sample supply device and a crucible and tray transporting device. Each of the sections is automatically operated under controlling by a controlling section.

Abstract: An automatic weigher with a plurality of article batch handling units arranged in a circular formation is controlled by a single computer to perform two or more mutually independent combinational weighing operations. In order to allow different articles to be weighed, a dispersion feeder separable into individually vibrating table units with adjustable partition walls is provided at the center. For improving the efficiency of combinational weighing operations, each article batch handling unit is provided with a memory hopper and the computer is programmed to generally give higher priority to memory hoppers than to weigh hoppers such that memory hoppers are generally more likely to be selected by the combinational computations. The computer is also programmed to identify article batch handling units in which the total weight of article batches in the memory hopper and weigh hopper is less than a critical value and to combine their article batches.

Abstract: A platform weighing system (10) suitable for making accurate weight measurements of heavy objects, such as aircraft, is disclosed. Hardware and software combine to produce the accurate results. Analog hardware (14) includes hydraulic load cells (80a-80d), temperature sensing (91), filtering (90), and voltage-to-frequency conversion (104). Digital hardware (12) receives an oscillation signal output from the voltage-to-frequency conversion (104) and obtains load counts by monitoring the oscillation signal for consistent predetermined durations. The predetermined duration is chosen in software (226) to be immune to particularly pervasive noise signals. A microprocessor (16) converts load counts into a weight code which is output to a display (46). This conversion includes compensation for auto ranging (320), load cell excitation variance (282), temperature compensation (284), null offset variance (286), and zero drifting (304).

Abstract: A high speed mechanical weighing system includes a series of article holders carried by chains and forming a flexible conveyor in which the holders are individually pivoted for movement between carrying and discharging positions. The mechanical weighing devices are spaced along the path followed by the holders with stationary guides alongside the holders which are periodically interrupted to accommodate vertically movable weighing guides. The holders have support members which bear either upon the stationary guides or upon the weighing guides. The holders are closely spaced so that a rearmost support member of a leading holder is positioned to laterally overlap but not bear upon the foremost weighing guide member of a weighing station at which the trailing holder is being weighed. The weighing guide members are sufficiently long as to effect accurate mechanical weighing even if the holders are traveling at high speed.

Abstract: A novel combination weigher for producing a product charge of precise weight by combining the contents of a plurality of scales each of which contains a portion of the product charge is characterized by an auxiliary or standby weighing scale or hopper which provides a product charge if a controller determines that there is no combination of the scales which will provide a product charge within a specified weight range.

Abstract: A metering operation in a capsule filling machine is controlled based on a correction signal derived from capsules just filled with material and ejected therefrom, by sampling/weighing these capsules, and by processing the weighed value to generate correction signal wherein: a first step of sampling/weighing is performed at the start-up stage of the capsule filling machine by collectively weighing a plurality of capsules sampled in bulk at once, and the second step of sampling/weighing is performed in subsequent steady operation stage by individual weighing each capsule from the bulk one by one.An apparatus for performing the method has a sampling chute bifurcated in alternatively switchable two paths; i.e., a direct path and a controlled path, which share a common terminal i.e., a scale pan of a balance.

Abstract: Multiple digital load cells forming one or more weighing scales are connected together and to a common master controller in a local area network. The digital load cells are polled by and provide weight readings to the master controller. The weight readings are combined with a load position correction factor for each load cell and summed to provide a weight indication corrected for load position. The values of the load position correction factors are determined during set up of the scale and stored at the master controller. An individual load cell can be diagnosed remotely and replaced if defective. A new load position correction factor is determined and stored for a replacement load cell.

Abstract: An automatic slicing machine includes a dynamic weigher for weighing slices in a draft as they are being cut. Information from the weigher is converted into a digital value and is used to control the thickness of subsequently cut slices to produce drafts at a target weight. After the cutting of a draft is completed, its weight is checked in a check weigher. The check weigher communicates the weights of individual drafts back to a programmable controller in the slicer. The controller computes a new target weight to correct any deviation of the final weight from the set point for weight control. This automatically calculated correction eliminates manual adjustment by the machine operator and assures that subsequent drafts have an acceptable weight.

Abstract: In a combination weighing machine comprising a pluality of weighing units and a plurality of product feeders for feeding product to the respective weighing units, a device for controlling the amount of product fed to each weighing unit based upon the deviation of the weight data from each weighing unit from a predetermined target weight for each feeder. The amounts of product fed to respective weighing units can be controlled independently.

Abstract: A system for processing articles selected for purchase and bearing distinct identification codes comprises, in one version: (a) a code reader for generating an output signal indicative of such article identification code; (b) a conveyor for receipt and transport of such article; (c) an entrance sentry for defining an inlet to a secured zone extending along a portion of the conveyor and for generating an output signal indicative of entry of the article into the secured zone and of a measurable characteristic of the article; and (d) a controller for selective movement of the conveyor in respective article acceptance and article rejection senses.

Abstract: An automatic span adjusting device incorporated in a weigher for correcting deviation of the weight signal provided by the weigher from the true weight of product being weighed by the weigher, the device including a memory storing weight values of a plurality of reference weights for span correction and means for automatically reading one of the stored weight values from the memory to provide it for calculating a span correction coefficient.

Abstract: An apparatus for self-service check out which calculates, within a main computer, the cumulative total weight of items, based on pre-determined and pre-programmed weights, and compares the computerized cumulative total weight to the weight determined by a second weigh scale means which determines the total weight of all items placed in a receiving container means. Items scanned by electronic means are itemized by the computer which directs the printing of an itemized register tape. Fraudulent mishandling of items by the customer is overcome by communication between the computer and ending weigh scale when weights calculated by each correspond within a determined tolerance level. In an alternate embodiment, a weighing of pre-scanned items in total is required to correspond with the total weight calculated by the computer and the end weigh scale, within a determined tolerance level.

Abstract: A device for measuring the moisture content and basic weight of paper in a gravimetric and more accurate manner than before. The device includes a cutting device for cutting the sample from a specimen sheet, a balance for weighing the sample, a computer for computing the moisture content and the basic weight of the sample, an output device for printing out the results of the moisture content and basic weight as well as a controller for controlling the device automatically and advantageously a drying device for drying the sample.

Abstract: A high speed weighing system for weighing articles moving along a conveyor or the like wherein the article to be weighed is dropped onto a weighing platform and weighed during a predetermined time period as it traverses the weighing platform. The weighing platform is secured to a structural transducer having electrical strain gauges in connection with fast-summing amplification and integration circuitry.

Abstract: An apparant density measuring device for a weighing machine comprising a bucket having a known loading volume. Product is fed to the bucket in an amount sufficient to cause overflow from the bucket, the bucket being vibrated for a specific time during this feeding operation. After completion of the feeding operation, the loaded bucket is weighed.

Abstract: An apparatus for depositing of reference weights in an electronic scale consisting of two levers swivelable around vertical axes, one end of each lever is always in contact with a cam disc attached on a vertically disposed shaft and the other end of which is developed as a gliding shoe which may be pushed below the lifting tray. By rotating the cam shaft, the lifting trays cause the reference weights to be deposited by the cam discs at first each individually one after the other and then jointly onto the carriers.

Abstract: A slicing machine for cold cuts with a carriage for the goods to be sliced (2), an arresting plate, a blade (3) a depositing device (4) and a depositing tray (7) on a slidable, rotatable or vertically adjustable tray carrier (8) is equipped with a load cell (10), to which the depositing tray (7), respectively its carrier is fastened on the load side. The load cell (10) is mounted on the carrier ( 8) to ride along therewith. The load cell (10) is connected to an evaluating circuit and an indicator (19,21). A keyboard (6,20) for the price per kilogram or for the input of a target weight, respectively of a desired number of slices can further be provided, which is connected over the evaluating unit with the drive of the carriage (2) for the foodstuff to be cut, for the purpose of its uncoupling.

Abstract: When a weigh feeding system which senses the rate of material feed by weighing the material and automatically controls the actual feed on the basis of a departure of the sensed rate of material feed from a desired rate, thereby to produce an error signal, is subjected to a major or sporadic disturbance such that the sensed rate departs from the desired feed rate by more than a predetermined amount, the system limits the feed rate used to produce the error signal to a synthetic amount no matter by how far the sensed feed rate departs from the desired rate, the values of said predetermined amount and said synthetic amount being selected in accordance with the nature of the system, the degree of accuracy desired, and the nature of the expected disturbances, thereby to improve the overall accuracy of the system when subjected to such disturbances.

Abstract: A weight measurement apparatus, includes a weight scale having a weight output for providing a weight output signal indicative of the apparent weight of an object being weighed. An accelerometer (or an array of accelerometers) is used to measure a force which contributes to the apparent weight and causes the apparent weight to deviate from the object's true weight. A computer coupled to the scale and the accelerometer computes the true weight of the object from the apparent weight and the accelerometer output. This true weight is displayed on a digital display.

Abstract: An apparatus for measuring a travelling fiber lap prior to introduction thereof into a fiber processing textile machine. There is provided a thickness measuring device contacting the fiber lap for mechanically detecting thickness fluctuations thereof. A first transducer is connected to the thickness measuring device for converting mechanical signals into electric signals representing the thickness fluctuations, and a computer is connected to the first transducer for receiving the electric signals from the first transducer and a display device connected to an output of the computer.

Abstract: Apparatus making it possible to effect accurately in line and continuously the weight feeding of granulated or pulverulent products.It comprises two separated endless belts for extraction and dispensing. The endless belt of the dispenser is continuously weighed as a whole and the speed of the extraction apparatus is controlled to the measurement of the instantaneous load of product distributed on the dispenser belt.

Abstract: An apparatus for testing a metal detector is incorporated in a combination weighing system where the metal detector is located to monitor product as it passes through a discharge chute of the combination weighing machine into a package. The apparatus includes a computer programmable by an operator to initiate a metal detector test operation. Upon such initiation, the computer holds out a first one of the scales from one or more subsequent combination searches while a metal test object is deposited in a first scale. Then the computer performs a combination search of the scales to select a test combination which includes the first scale and other scales as needed to achieve the target weight, discharges the selected combination and monitors the output of the metal detector or determine if it is working. Related methods are also disclosed.

Abstract: An electronic balance having a stored setup routine for defining scale operating parameters. An indicating device, which may be interchangeably connected to a plurality of weighing platforms, is responsive to an identifying connector to select from a memory operating parameters related to an operational characteristic of the weighing platform during the setup routine. A plurality of multi-function manually actuated buttons permit user selection of operating parameters during the setup routine. A sealable switch is used to restrict access to the setup routine. The balance operates in weighing or parts counting modes and can display weight in the parts counting mode. The balance can also provide a user with an indication of whether a dead-load or span adjustment is necessary.

Abstract: A device (100) for calibrating load cells is provided. Device (100) features an intermediate chamber (8) providing fluid communication between spaced-apart fluid chambers (4) and (6). Chambers (4) and (6) have respective upper open ends (5) and (7) with chamber (4) connected to a plunger member (12) by a flexible seal (14) and chamber (6) connected to a plunger member (20) by a flexible seal (18) such when dead weights W.sub.1, 2 . . . n are placed upon plunger (12) fluid pressure exerts an upward force (F) against plunger (20) for calibrating a load cell (2) placed between plunger (20) and a rigid frame (21) that is defined by the equation:F=(A.sub.R /A.sub.P)(W.sub.1, 2 . . . n +W.sub.P -S.sub.P)-W.sub.R -S.sub.RWhere:A.sub.R =area of plunger (20)A.sub.P =area of plunger (12)W.sub.P =weight of plunger (12)S.sub.P =resistance force of seal (14)W.sub.R =weight of plunger (20)S.sub.R =resistance force of seal (18).

Abstract: An electronic weigher includes a load cell for producing as an output an electric signal proportional to a load, an operational amplifier for amplifying the electric signal produced by the load cell, A/D converter for converting an output signal produced by the operational amplifier into a digital signal, a bias circuit for delivering a dummy signal for test purposes to the operational amplifier, and a switch disposed between the bias circuit and the proportional amplifier for applying the dumy signal to the operational amplifier, wherein amplification circuitry from the operational amplifier to the A/D converter is diagnosed by operating the switch.

Abstract: An automatic weighing system for delivering quantities of product measured by weight, each quantity having a weight equal or approximate to a predetermined target weight, in such manner that the volume of each quantity falls always within a predetermined allowable range even when the product to be weighed has a substantial variance in its apparent density or specific gravity. The system includes means for measuring the apparent density and means for controlling the target weight in accordance with the measured value of apparent density.

Abstract: A process and apparatus for measuring the flow rate of solid granular material in which a sample holder of variable geometry is provided with an aperture containing a shutter. The aperture is opened and the material is collected and weighed. Either the time to collect a given weight or the weight collected in a given time is determined and combined with signals representing the sample holder geometry, aperture cross section and material constants to provide a measure of flow rate.

Abstract: A method for fast weighing on an electronic scale is disclosed. Periodic samples are taken of the weight of an object placed upon the scale, and succeeding samples are compared for similarity within a given tolerance. The overall range of the scale is divided into various regions based upon frequency of use and reliability of readings. Fewest readings are required for that scale region of most frequent use and greatest reliability, thereby minimizing the time required for completing the weighing of objects with weights falling within that region.

Abstract: A platform weight scale comprising a capacitative load cell sensing means configured to be insensitive to off center loading of the horizontal platform regardless of load amount or location on the platform. The platform is supported by a plurality of springs selected for equal spring rates. The load cell is electrically connected into a FET (Field Effect Transistor), CMOS (Complementary Metal Oxide Semiconductor) or Bi-Polar semiconductor multivibrator circuit selected and designed to sense electric currents on the order of 10.sup.-13 amperes. In one preferred embodiment the load cell comprises a grounded hemispherical surface opposing a flat charged plate. In alternate embodiments the load cell comprises a differential capacitor or a parallel plate capacitor suspended in a manner that is insensitive to off center loading. An additional embodiment for the load cell comprises a spherically concave surface opposing the above grounded hemisperical surface.

Abstract: A device used with a conveyer weigher for automatically correcting dynamic weight signals indicative of the weights of articles successively fed to the weighing conveyer of the weigher at constant intervals, wherein the weight signal of each article is influenced by the "aftereffect" of that of the preceding article, which can automatically change the rate of correction when any article drops out from a regular interval feed line, thereby obtaining the true static weight of each article at any time.

Abstract: Method and apparatus for the improved operation of an electronic computing scale provides significantly increased resolution in a first weight sub-range (0-12 pounds in the illustrative embodiment). A coarser resolution is provided in a second weight sub-range (11-100 pounds). The raw load cell voltage is communicated along first and second branches, and subjected to a different transformation in each branch to produce first and second transformed voltages. In the first branch, raw voltages corresponding to weights in the low sub-range are mapped onto a desired sub-range of voltages. In the second branch, raw voltages corresponding to weights in the high sub-range are mapped onto a second sub-range of voltages. Depending on the weight on the scale, one or the other of the transformed voltages is applied to the ADC input terminal, and the digital output is scaled accordingly. The circuitry includes a range flag and logic circuitry for sensing the digital ADC output, and controlling the range flag.

Abstract: A signal processing circuit for a weighing apparatus comprises an amplifier circuit for amplifying a weight signal outputted from a weighing device, an active filter which serves to attenuate noise components in the weight signal from the amplifier circuit, and switches for selecting whether the active filter should function as a filter or a buffer according to a predetermined timing schedule.

Abstract: An automatic span adjusting device incorporated in a weigher for correcting deviation of the weight signal provided by the weigher from the true weight of product being weighed by the weigher, the device including a memory storing weight values of a plurality of reference weights for span correction and means for automatically reading one of the stored weight values from the memory to provide it for calculating a span correction coefficient.

Abstract: An apparatus for automatically adjusting a preselected volume of material dispensed by a volumetric filling machine into containers to be filled by weight. The apparatus has a scale for sequentially weighing a plurality of containers each containing the preselected volume of material dispensed by the filling machine and sequentially generating an equal plurality of weight signals representative of the weight of the dispensed material in the containers. A microprocessor receives and stores the sequential weight signals and stores them in a memory, and calculates an average weight value. The microprocessor then compares the average weight value to a preselected weight value and generates a correction signal representative of the comparison. A controller responsive to the correction signal adjusts the preselected volume by an amount sufficient to cause the average weight value to be equal to the preselected weight value.

Abstract: A load cell scale includes a memory for storing span data, a weight data generating circuit for generating weight data corresponding to load weight, and a data processing unit for generating weighing data on the basis of the weight data and span data. The scale further includes first and second keys, and a nonvolatile memory having first and second memory areas. The data processing unit responds to the operation of the first key to store, as zero-point data, the weight data from the weight data generating circuit, into the first memory area of the nonvolatile memory. The data processing unit further responds to the operation of the second key to store, into the second memory area of the nonvolatile memory, the difference between the zero-point data and the weight data from the weight data generating circuit. The difference data is used as span data.

Abstract: An apparatus for detecting an amount of liquid nitrogen, has a table for supporting a Dewar vessel in which liquid nitrogen used for cooling a semiconductor radio detector is contained. A motion conversion mechanism is engaged with the table for converting the movement of the table in the up and down direction in response to changes in the weight of the liquid nitrogen in the vessel and amplifying and movement. The motion conversion mechanism includes a disk rotated by the amplified motion of the table, and a plurality of sensors adjacent the disk for detecting the rotational position of the disk which is representative of the weight of the liquid nitrogen in the vessel.

Abstract: The check-out counters for use in a supermarket, or the like, are provided with a laser scanner for reading the UPC labels on the individual products presented to it by each customer. The counters are also provided with transport belts or conveyors controlled by a central processor which, in turn, is supplied with information from a weigh scale under the input conveyor and from optical curtain devics at strategic locations along the belts and in a bagging area. The outfeed conveyor operates through a tunnel such that a customer cannot reach a product being conveyed therethrough. An opticl curtain disposed at the entry to the tunnel is broken by passage of an article into the tunnel and also by a customer reaching into the tunnel. Products are conveyed to the bagging area if (1) the actual weight of the product as determined by the scale corresponds to the anticipated weight obtained from a memory bank based upon the product UPC label identification and (2) none of various other events have occurred.

Abstract: An apparatus and process for the metering of predetermined quantities of at least one product to be delivered to at least one mobile receiver by means of a distribution station which comprises means effecting the discharge of a product from a container, a device effecting simultaneously the preliminary storage, homogeneization and the transfer of the product to a weighing assembly comprising a metering feeder equipped with means to deliver the product to a mobile receiver, means to effect static weighings and dynamic weighings, means to conduct automatically the operations of weighing and the delivery of the product to the mobile receiver, means to effect the transfer of the product to the mobile receiver and to obturate the outlet of the weighing assembly, and the elements of the distributor station are further equipped with means to create and to maintain the impermeability of the apparatus with respect to the product involved and the elements of the environment.

Abstract: A system for compelling weighing machines to participate in a combinatorial weighing operation operates by updating the number of times a weighing machine is not selected for a combination, whenever a single combination giving a total weight value within preset allowable limits is obtained by combinatorial computation. The number for a weighing machine which is selected for a combination, is reset whenever a single combination giving a total weight value within preset allowable limits is obtained by combinatorial computation. A weighing machine, which has not discharged its articles for a large number of cycles, is compelled to participate in a combinatorial computation.

Abstract: System and method for providing a stable digital display of a value which fluctuates such as the input signal produced by a moving load on an electronic weighing scale. Digital readings are integrated over time, and the variations in the digital readings become insignificant compared to the sum of the readings in the historical average. Weight readings are automatically calibrated for span and linearization.

Abstract: A method for recalibrating an electronic scale mounted within an enclosure which includes a display and a plurality of switches set to a position representing the calibrated digital output of the scale when the scale is placed in a first and second weighted condition includes the steps of displaying the weight of the weighed condition of the scale, sampling the scale to generate digital signals outputted by the scale when the scale is placed in the first and second weighted condition, comparing the sampled digital signals with the digital signals represented by the setting of the switches, removing the scale from the enclosure when the sampled digital signals are within a predetermined value of the digital signals set up in the switches and displaying the new settings of the switches which corresponds to the sampled digital signals enabling the operator to set the switches accordingly.

Abstract: A combinational weighing system with a plurality of weighing devices employs at least three central processing units such as microprocessors. One keeps monitoring the weight information from the weighing devices and analyzes stability of weight data. Another one controls the charging and discharging of the weighing devices. The third performs combinational computation to select a combination. The system has increased flexibility regarding operation and adjustments, and allows efficient methods of zero-point and span adjustment of weighing devices. Its compact unitized input-output unit allows the user to operate the system interactively.