Abstract: In the weighing apparatus, a plurality of weighing sections are connected to a main unit having a display section, and weight data from one of the weighing sections are indicated by the display section. Each weighing section has an instability detection section for detecting the instability of a weight signal. The main unit has a section by which the weight data from the weighing section whose weight signal is instable are selected on the basis of a signal from the instability detection section.
Abstract: In a packaging system where a pasty material is dosed as portions into individual containers to form individual packages, at least one dimension of the portions is measured to produce actual-value outputs that correspond to the volumes of the respective packages and that are compared with a set point corresponding to a desired volume. The dosing of the portions is altered on deviation of the volume outputs from the volume set point so as to bring same into agreement. In addition the packages are weighed downstream to produce actual-value outputs that correspond to the weights of the packages and that are compared with a set point corresponding to a desired weight.
Abstract: A weighing scale for continuously weighing a fiber layer running therethrough. The weighing scale includes an endless conveyor belt having a transporting face for supporting and advancing the fiber layer and a drive for circulating the conveyor belt. There is further provided a carrier frame on which the conveyor belt and the drive are mounted and a weighing cell for emitting a signal representing the magnitude of a weight applied thereto. The weighing cell supports the carrier frame, the conveyor belt and the drive. An elastic holding element is affixed to the carrier frame. The elastic holding element is elastically readily deformable in a vertical plane, while it is substantially unyielding in a horizontal plane, whereby the carrier frame is prevented by the elastic holding element from motions in horizontal directions.
Abstract: A weigh feeding apparatus for pourable substances such as granulates, powders and fluids consisting of a container equipped with a controllable device for discharging the substance, weighing apparatus for the container or for a conveyor arranged subsequently to the discharging device. Attached to this is an electronic circuitry provided with a computer for the regulation and control of the discharging device, which counts the digital measuring signals of the weighing apparatus during a period of time, compares them with a reference value and produces a setting or control value for the discharging device at a divergence of the signal.
Abstract: A plurality of individual plastic material ingredients are metered from respective individual material hoppers at controllable individual discharge rates, blended, and delivered to a common hopper. The blend of plastic material ingredients in the common hopper is discharged to an extruder or other material processing machine. The material processing rate of the processing machine is determined based on the sum of the discharge rates of the individual ingredients to the common hopper plus or minus the discharge rate of the blend from the common hopper to the processing machine. The discharge rates of the individual material ingredients from the individual hoppers to the common hopper is controlled as needed to maintain a preset recipe of the blend at the determined material processing rate of the processing machine.
Abstract: Electronic weighing apparatus includes a main scale housing (1) within which is arranged a calibration weight housing (33, 133) containing a calibration weight (75, 175) operable between weight-applying and weight-removed conditions relative to horizontal projections (79, 179) that extend from load receiver (15) through wall openings (81, 181) into the calibration weight housing. The calibration weight is operable by a carrier member (57, 157) that is vertically movable by means of a pair of horizontally spaced wedge-shaped lifting members (39, 139) that are displaced toward and away from each other, respectively, by a spindle (41) having threaded portions (43a, 43b) of opposite pitch, which spindle is driven by a reversible motor (53).
Abstract: Apparatus and method for improving the accuracy of weighing an object using a scale, when the object to be weighed may not be positioned completely on the scale, by performing a first weighing operation, slightly moving the scale on which the object is weighed, performing a second weighing operation, comparing the results, and providing an indication to the scale operator if the two results are not the same. The operator can then reposition the object to be weighed so that it is completely located on the scale, and perform a further weighing operation. The movement of the scale between weighings may be in a horizontal or vertical direction, or in a combination of the two.
Abstract: A fast retail security weighing system is disclosed whereby if a second purchased item's product code is entered before the weight corresponding to the first purchased item's product code has been measured and verified, the system will consider the weight on the scale as corresponding to the first purchased item alone, but if such weight does not correspond with the allowed weight for the first purchased product, then the system will consider whether the weight on the scale corresponds to the summation of the first and second purchased items' weights. The fast retail security weighing system may also approximate the actual weight on the scale from the rate of weight change and the instantaneous weight reading.
Abstract: The present invention describes a method and apparatus for weighing customers entering and leaving a store, or a user entering and leaving a particular institution or a worker entering and leaving the workplace and ascertaining automatically that the equivalence of the said two weight values do not indicate that any goods have been fraudulently removed by the person in question and where said equivalence does not occur, initiates an alarm protocol. In the preferred embodiment of the present invention the customer is weighed upon entering the retail store and is given a bar coded printed token indicative of his/her weight. At the checkout stand, with the customer's purchased products still resting typically in the shopping cart or on the checkout stand, the customer is weighed again and scans in the bar coded printed token previously obtained. The customer's weight should remain significantly unchanged if no products have been fraudulently obtained.
Abstract: Apparatus for receiving and sorting a plurality of pieces of flatware for delivery of the flatware to a holding or storage mechanism, the apparatus comprising a tube mechanism comprising a wall forming a tube having an open end for slidable delivery of the flatware pieces to a holding mechanism, the tube mechanism having a selected length, a selected internal volume and a slot extending lengthwise in the wall for receiving pieces of flatware lengthwise through the slot, the flatware pieces having a selected length and depth. The tube mechanism is pivotably mounted on a support structure at a selected point along the length of the tube mechanism such that the slot is disposed upwardly for receiving the pieces of flatware downwardly through the slot and into the internal volume of the tube mechanism.
Abstract: The present invention relates to a dynamic weight control system for a slicing machine, used to slice bacon or other food products, that has both primary and secondary weighing systems. The slicing machine has a slicing blade and a feed mechanism for feeding a food product (e.g., a bacon slab) into the slicing blade at a controlled rate. The primary weighing system controls primary slicing and weighing of multi-slice drafts of the sliced products so that each draft is an approximation of a prescribed control weight. The secondary weighing system checks draft weights and supplies data to a computer that computes an average weight for those drafts that are within an acceptable weight range; it also computes the pass ratio of acceptable weight drafts for a sample group of drafts.
Abstract: A data gathering system adapted to be installed within a checkout counter for determining information about products presented for purchase at the counter including the weight of such products comprises two support flanges within the checkout counter. The support flanges define a portion of an upper surface of the data gathering system and a scale supported by the flanges defines the remaining upper surface which comprises a weighing platter for the scale. A scale calibrating and zeroing system is incorporated into the support flanges to be accessible through the upper surface of the data gathering system such that the scale can be periodically zeroed and calibrated as necessary to maintain the accuracy of the scale without removal of the data gathering system from the counter.
Abstract: Apparatus and method are described for measuring and recording as a function of time the resultant-weight of a test object immersed in a fluid medium. The apparatus and method are particularly suitable for determining a change in a chemical and/or physical property of a material exposed to a fluid, and for measurements such as of the floating forces produced by buoyant pharmaceutical dosage forms. An electronic toploader balance, with a weight-transmitter device connected to an electromagnetic measuring module of the balance, is positioned above a container so that the lower end of the weight-transmitter device extends into a solvent within the container. The weight transmitter device performs the double function of holding the test object submerged in the solvent and of transmitting to the balance the reacting force, that is the resultant-weight of the test object.
Abstract: Two embodiments of a low profile weight sensor for a weight sensing system for monitoring article input and removal from article storage apparatus comprises a plate or I-shaped bar support member having first and second sections, an integrally formed linkage system for connecting the first and second sections such that the sections are substantially coplanar in an unloaded state, and are relatively displaceable with respect to each other in response to a weight load applied to one of the sections; and a magnetic transducer mounted on surfaces extending in the thickness direction of the plate/bar member for producing an electrical output signal responsive to relative displacement of the first and second sections.
Abstract: A system for controlling the feed rate from a vibrating feeder including a device for sensing the amount of materials being discharged from the feeder, an apparatus to change the slope angle of the feeder, and a controller operatively connected to the sensing device and the slope changing apparatus to actuate the apparatus in response to changes in the weight or volume of materials being discharged from the feeder. The sensing device can be connected to a take-away conveyor unit that receives the materials being discharged from the feeder. The slope changing apparatus raises or lowers one end of the feeder to change the slope angle of the feeder while it operates.
Abstract: The invention provides a method of assessing the weight of items passing along a conveyor line, which comprises directing the items to pass from the conveyor line onto a conveyor means positioned beside the line so that the items by-pass a length of the conveyor line before rejoining the latter, and weighing the items on a weight assessment device (such as a weigh load cell) included in the conveyor means.Also provided is apparatus for use in such a method comprising a conveyor means, including a weight assessment device, for location beside the conveyor line, and means for directing the items onto the conveyor means so that they by-pass a length of the conveyor line before rejoining it. The conveyor means conveniently comprises an infeed sction, for acceleration and separation of the items and an outfeed section for realignment of the items prior to their return to the conveyor line.
Abstract: A material dispensing monitor including an encoder and sensor adjustably mounted to a securement and a pump as a function of specific gravity to produce a series of pulses per cycle of the pump as a function of specific gravity and capacity of the pump so that the pulses provide a direct measure of weight. An all pneumatic system monitors and displays the weight of material dispensed and can provide annunciation when a predetermined weight of material has been dispensed.
Abstract: Parallel infrared beams are directed along opposite edges of an electronic scale which has its weighing platform mounted flush with a supermarket check-out counter. In the event that an object being weighed overhangs the scale and contacts the counter, it will break one or more beams. Means are provided for detecting the interruption of a beam and a disable control signal is generated. Normally, an electronic cash register is connected to an output of the scale for computing the price of a weighed object. However, when the disable signal is generated, communication between the scale and the electronic cash register is disabled, thereby preventing computation of an incorrectly weighed object.
Abstract: The gravimetric control of a mass flow from or into a container located on a balance using a pulsating dosing pump, the output signal of the balance is digitally filtered in such a manner that the course in time of the mass flow is cyclically estimated from the filtered wighing signal. This estimated value of the course in time of the mass flow is used to calculate the course in time of an auxiliary mass flow which compensates the pulsation of the mass flow of the pulsating dosing pump and a speed course is calculated from the course in time of the auxiliary mass flow for driving an auxiliary dosing pump.
November 16, 1990
Date of Patent:
September 10, 1991
Paul von der Haar, Madhukar Pandit, Hermann Merz
Abstract: The invention refers to a method for the determination of the area of drawings which have been drawn on paper sheet or other like drawing material and to a device for implementing the method. In the method of the invention a natural quantity and in particular the weight of the paper sheet or other drawing material is used in correlation to the surface area of the same, in order to determine a coefficient of correlation of weight per unit area of the drawing material. By means of cutting off and weighing that portion of the paper sheet or other like drawing material, one can thus and after having calculated the abovementioned coefficient of correlation of weight per unit area determine the area of the desired portion.
Abstract: Vessel balance for bulk material having a tubular balance section for feed therethrough of bulk material. The balance is adapted during feed intervals of the bulk material to enable determination of the weight thereof. The section cooperates with a feed flap adjacent one of its ends to govern entry of the material into the section and has a closing member at an opposite end. The section and member are supported by at least two weight measuring elements carried by a fixed platform.
Abstract: A method and apparatus for the automatic determination of a continuous bulk material through a continuous balance wherein a weighing vessel, an adjustable closure member movable in the weighing vessel for adjusting an outlet cross-section of the weighing vessel and an electronic weight difference measuring device are provided. The closure member provided in the outlet region of the vessel is so arranged that when the closure member is in the open operating position, there is a free mass flow in the weighing vessel and the bulk material flows freely and unhindered from the outlet of the weighing vessel. A control device is connected at its input to the weight measuring device and at its output to the adjustable closure member whereby a signal corresponding to the weight change in the weighing vessel per unit of time is produced, which is used for calculating the parameters of state of the bulk material flow.
Abstract: The present invention is directed to a cap for a medicine bottle for monitoring a patient's medicine compliance. It involves weighing a container of medicine with cap which includes scale means located therein which is connected to a computer chip with a display unit also located in or on the cap. The chip may store the starting weight or tare weight, plus total weight and when the container or medicine is picked up by the cap at any time, actual weight is fed to the chip. The computer chip may then determine the difference between the starting weight and/or display actual amount of medicine remaining or consumed. The container of medicine is reweighed from time to time with the cap and the chip may compare actual weight with compliance required weight to determine compliance and the cap may visually display the compliance results on the display unit to inform the patient. An optional audio assist may direct the patient to "call the doctor" if a significant compliance deviation is recognized.
Abstract: A low power consumption controller for weight based article input and removal monitoring apparatus comprises a continuously active weight monitoring section responsive to the weight sensor output(s) for producing a first control signal in response to predetermined changes in the sensed weight; and a signal analysis section switchable from an inactive mode to an active mode in response to the first control signal for analyzing the sensor output(s), and for controlling the operation of the weight monitoring section.
Abstract: A method of dispensing at a tap an effervescent liquid from a keg-like supply comprises the steps of generally continuously monitoring the weight of the supply and generating an output corresponding thereto, collecting at the tap the liquid that overflows from a vessel into which it is being dispensed, weighing the collected overflow liquid and generating an output corresponding to this weight, comparing the outputs and calculating the difference therebetween, and periodically recording the difference.
Abstract: A method and apparatus for determining the collectability of dust particles is disclosed herein. The concept of collectability and collectivity are employed to establish fundamental equations which are solved by the use of data obtained by passing a dust laden gas through a sampling train having a plurality of impingers. The weight of material collected in each separate impinger is determined and using these individual weights a mathematical matrix is set up from which the collectability of the dust particles is obtained. The collectability of a given dust particle is defined as its impinger efficiency when the impinger is operated in strict accordance with design specifications. Collectivity is defined as the collectability distribution of a mixture of dust particles having different collectabilities.
Abstract: An electronic weighing apparatus is provided, including a self-contained calibration weight module that is operated by a motor to alternately connect and disconnect, respectively, a calibration weight relative to the vertically-displaceable parallelogram-guided load receiving member of the scale. The calibration weight is normally suspended in an inoperable condition by means of a pair of internally threaded sleeves rotatably supported in the cover portion of the housing of the calibration weight module. A motor is operable to rotate the sleeves and thereby lower lifting screws threadably connected therewith, whereby the calibration weight is lowered toward a supported position between and in engagement with a pair of parallel carrier arms that extend horizontally from the load receiver.
Abstract: A weighing arrangement comprises a conveyor system defining a path for articles and including a first feed conveyor, a second upwardly inclined conveyor arranged to receive articles from the first conveyor and a third, downwardly inclined conveyor. The first and second conveyors have respective first and second motors for independent drive.The weighing apparatus has a weight measuring component in the form of a rotatable cylinder which cooperates with load sensing means.In use, an article is fed from the conveyor to the cylinder of the weighing apparatus. Operation of the weighing apparatus is based on the principle that as the article changes direction to be discharged via the downward conveyor there is an instant at which the total mass of the article passes through its center of gravity so as to act directly downwardly via the cylinder on the load sensing means.
Abstract: A highly accurate weighing, feeding and conditioning apparatus for powders and other fine particulate materials is provided. The material is conditioned in a hopper by pulsating inflatable pads within the hopper, or by ultrasonic transmitters mounted on the hopper walls, in apertures in the hopper walls, or on a body at least partially submerged in the fine particulate material. The material is fed by a double auger, one inside the other. In bulk feed mode, both augers rotate at a first, higher speed. In dribble feed mode, only the inner, smaller auger is rotated, at a second, lower speed. This arrangement provides a turn-down ratio of about 500:1. The entire assembly is coupled to a high resolution balance, such as a magnetic force restoration balance, for accurate control of the weight of material fed.
Abstract: An apparatus for the automatic determination of a continuous bulk material throughput through a continuous balance comprises a weighing vessel, an adjustable closure member for adjusting an outlet cross-section of the weighing vessel and an electronic weight difference measuring device. The closure member is connectable to the weighing vessel in the outlet region thereof which is formed as an adjustable wall part and is so arranged that when the closure member is in the open operating position, there is a free mass flow in the weighing vessel. Simultaneously it is ensured that the bulk material flows freely and unhindered from the outlet of the weighing vessel.
Abstract: An electronic balance with a calibrating weight circuit and with a digital processing unit for the automatic drive of the calibrating weight circuit that includes a proximity sensor is built into the balance and that the automatic drive of the calibrating weight circuit by the digital signal processing unit be blocked as soon as the proximity sensor emits an output signal.
August 21, 1989
Date of Patent:
June 12, 1990
Franz-Josef Melcher, Dieter Berthel, Gunther Maaz, Christian Oldendorf
Abstract: This invention provides an electronic balance comprising a housing; weighing means enclosed in the housing; a pan on which an object to be weighed is placed and having a space under the top plate thereof; a sensing member having one end connected to the weighing means and projecting out of the housing top wall, with the other end of the sensing member being connected to and supporting the pan outside the housing; a calibration weight arranged in the space under the pan; and operating means for loading and unloading the calibration weight on and from the sensing member. There are disclosed a variety of constructions of the operating means.
Abstract: Weighing apparatus including variable capacitance load sensing means, a capacitance detection circuit, an analog to digital convertor and microcomputer control means is automatically verified for accurate operation. The capacitance detection circuit is provided with a computer controlled verification switch by which the value of a parameter, such as resistance in an attenuation circuit, can be changed. Automatic verification of correct operation is obtained by periodically, with no weight on the scale, obtaining a first weight reading, operating the verification switch to change the parameter and obtaining a second weight reading. The difference between the two readings is a verification value and is compared to a stored verification value obtained in the same manner during calibration and stored for later use. If the difference between the obtained and stored verification values exceeds an allowable limit, the scale may be disabled from further weighing.
Abstract: A self-service check-out counter for cashier-unattended use and operation includes an laser scanner for automated reading of product identification codes borne by articles to be purchased, a keyboard for manual entry of article-identifying information, a variety of indicators and signalling devices for instructing actions by the customer, devices for preventing pilferage, fraud and inadvertent errors and an integral bag forming apparatus for manufacturing custom-formed bags on-site at the counter and on demand and, preferably, custom-sized to conform to the volume of articles to be packed in the bags. A customer individually scans articles to be purchased and the scanned data is verified through comparison with stored product identifying information. Following verification of each article, customer placement of the article into the bag forming apparatus in enabled and a bag preferably conforming to the volume of articles purchased in manufactured within the check-out counter.
Abstract: A scale utilizes a plurality of load cells positioned beneath a weighing platform for determining the weight of objects placed upon the platform. During a weighing operation, each load cell generates a voltage proportional to the response of said cell to the application of a weight to the platform. Each such generated voltage is transmitted serially through a multiplexer and is converted to a digital value by an analog-to-analog converter. These digital values are employed by a microprocessor to determine the weight of the object placed on the weighing platform. The scale is calibrated by weighing a test weight in a plurality of different locations on the weighing platform, and utilizing the individual digital values thus obtained for each load cell in a plurality of simultaneous equations, which are then solved in the microprocessor to provide constant values associated with each load cell, which are used in subsequent weighing operations.
June 12, 1989
Date of Patent:
March 20, 1990
Mark R. Vitunic, Barry M. Mergenthaler, Gene L. Amacher
Abstract: The present invention is directed to a method of monitoring a patient's medicine compliance. It involves weighing a container of medicine to determine a starting weight on a scale which is connected to a computer with a display unit and storing the starting weight in the computer followed by reweighing the container of medicine after a prescribed dosage is consumed to determine a second weight. The computer then determines the difference between the starting weight and said second weight to store a dosage unit weight. The computer is programmed to calculate compliance required weights of the container for each dosage administration for the prescription period of the medicine. The container of medicine is reweight from time to time on the scale to compare actual weight with compliance required weight to determine compliance and the computer visually displays the compliance results on the display unit to permit compliance monitoring.
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.
November 14, 1988
Date of Patent:
September 5, 1989
Alberta Energy Company Ltd., Canadian Occidental Petroleum Ltd., Esso Resources Canada Limited, Gulf Canada Resources Limited, Her Majesty the Queen in right of the Province of Alberta as represented by the Minister of Energy and Natural Resources, HBOG-Oil Sands Limited Partership, Pan Canadian Petroleum Limited, Petro-Canada Inc.
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: 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).
October 19, 1988
Date of Patent:
July 18, 1989
Christian Oldendorf, Franz-Josef Melcher, Christoph Berg
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 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: 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: 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 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).
April 4, 1988
Date of Patent:
June 6, 1989
General Electrodynamics Corporation
Dick E. Davis, Charles R. Brazell, Jerome E. Johnston
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 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.