US4044846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic zeroing of scales with digital display
Assignee: Individual
•
Filing: 1976-03-02
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Granted: 1977-08-30
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Expires: 1996-03-02
Abstract
Abstract A system for the automatic zero setting of scales having digital display of the weight is provided so that at tare weight of a bridge mechanism connected to a weighing pan of the scale the display will be as closely equal to zero as possible. Amplifiers and a voltage/frequency transducer are connected to the electrical measuring bridge. A presettable counter connects with the voltage/frequency transducer. The counter is preset so that at tare weight of the bridge mechanism the reading of the scale will be as close to zero as possible. In the path of the information going to the counter a correction unit is arranged. The count provided by the counter is observed by a differentiating unit for detecting deviations of a given magnitude in one direction or the other from a count value which produces a zero indication. The differentiating unit then supplies the correction order and direction of correction to the correction unit.
Inventors
- 👤 Waltteri Matilainen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:55
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/14; G01G23/16; G01G23/163; G01G23/18; G01G23/36; G01G23/37; Y; Y10; Y10S; Y10S177/00; Y10S177/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
261 words
A system for the automatic zero setting of scales with digital display after a normal weighing process comprising: a goods pan having measuring voltage means connected through a preamplifier to an adding amplifier unit having a low-pass filter; said amplifier unit with the low-pass filter being connected to a frequency and voltage transducer unit which is connected to a presettable BCD-counter and to a change of weight comparison means; said presettable BCD-counter being connected to a memory store which is connected to a calculator; the calculator being connected through a display drive to a display; a timer unit being connected to said BCD-counter, to said change of weight comparison means, to said memory store, to said calculator, and to said display drive; said BCD-counter being connected to a differentiating means for detecting deviations of a count value of the BCD-counter within given limits in one direction or the other from a count value producing zero indication, the differentiating means supplying a correction order and direction of correction to a correction data processing unit which is connected to a correction voltage means; said correction voltage means being connected between the BCD-counter and said measuring voltage means for causing a correction of the count value until it produces the count value corresponding to zero indication of weight; said change of weight comparison means being connected to said correction data processing unit for preventing correction during the normal weighing process when rate of weight change exceeds a given magnitude; said differentiating means and correction data processing unit also being connected to said timer unit.
Claim 2
Independent Claim
261 words
A system for the automatic zero setting of scales with digital display after a normal weighing process comprising: a goods pan having measuring voltage means connected through a preamplifier to an adding amplifier unit having a low-pass filter; said amplifier unit with the low-pass filter being connected to a frequency and voltage transducer unit which is connected to a presettable BCD-counter and to a change of weight comparison means; said presettable BCD-counter being connected to a memory store which is connected to a calculator; the calculator being connected through a display drive to a display; a timer unit being connected to said BCD-counter, to said change of weight comparison means, to said memory store, to said calculator, and to said display drive; said BCD-counter being connected to a differentiating means for detecting deviations of a count value of the BCD-counter within given limits in one direction or the other from a count value producing zero indication, the differentiating means supplying a correction order and direction of correction to a correction data processing unit which is connected to a correction voltage means; said correction voltage means being connected between the BCD-counter and said measuring voltage means for causing a correction of the count value until it produces the count value corresponding to zero indication of weight; said change of weight comparison means being connected to said correction data processing unit for preventing correction during the normal weighing process when rate of weight change exceeds a given magnitude; said differentiating means and correction data processing unit also being connected to said timer unit.
Claim 3
Dependent Claim
28 words
A system for the automatic zero setting of scales according to claim 1 characterized in that the differentiation range of said differentiating means is from 9990 to 0008.0.
Claim 4
Dependent Claim
78 words
A system for the automatic zero setting of scales according to claim 1 characterized by another differentiating means having a large differentiation range outside the differentiation range of said differentiating means, said other differentiating means being connected to a quick search means for giving correction pulses to said correction means for approach towards the count value giving zero indication in steps larger than steps of said differentiating means until the differentiation range of said differentiating means is entered.
Claim 5
Dependent Claim
68 words
A system for the automatic zero setting of scales according to claim 1 characterized in that said correction means is a presettable value correction unit which is connected between a presettable switch of the BCD-counter and said BCD-counter and that the differentiating means detecting the deviations of the count value given by the BCD-counter supplies correction pulses and direction of correction information to said presettable value correction unit.
Claim 6
Dependent Claim
25 words
A system for the automatic zero setting of scales according to claim 4, characterized in that said presettable value correction unit is a presettable BCD-counter.
Claim 7
Dependent Claim
46 words
A system for the automatic zero setting of scales according to claim 4 characterized by a ÷ 2 - dividing unit connected between said frequency and voltage transducer unit and said BCD-counter, said correction data processing unit being connected to said ÷ 2 - dividing unit.
Claim 8
Dependent Claim
107 words
A system for the automatic zero setting of scales according to claim 4, characterized in that the differentiating means supplies correction pulses only in every second measuring period, the correction data processing unit controlling a÷2 - dividing unit which is placed in the path of weight pulses so that when a correction pulse occurs and the direction is "up" the passage through the ÷2 - dividing unit of the first weight pulse arriving at the ÷2 - dividing unit is prevented, and when the direction is "down" the corresponding blocking of the weight pulse is performed in every second measuring period in which no correction pulses occur.
Claim 9
Dependent Claim
31 words
A system for the automatic zero setting of scales according to claim 7 characterized in that the correction pulses and the weight pulses arriving at the BCD-counter are of equal value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |