EP0131461A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Span adjustment in electronic weighing apparatus
Assignee: Ishida Scales Manufacturing Co Ltd
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Filing: 1984-07-06
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Granted: —
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Expires: 2004-07-06
Abstract
Abstract There is provided a system for adjusting the span of an electronic scale having a double-integrating A/D convertorfor converting a weight signal into a digital signal. The double-integrating A/D converter has a software-implemented timer for controlling a primary integrating time. The operation time of the software-implemented timer is adjusted linearly or in steps so that a digital value at the time a weight is placed on the scalepan of the scale will correspond to that expected for the weight. The adjustment of the operation time of the software-implemented timer can also be utilized to adjust easily for differences between gravitational accelerations corresponding to different weights in geometrical areas on the earth.
Inventors
- 👤 Kazufumi Naito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:42
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/01; G01G23/015; G01G23/012; G01G23/18; G01G23/36; G01G23/37; G01G23/3707
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
79 words
Span setting circuitry, for an electronic scale which provides a voltage signal proportional to the weight of an item being weighed thereby and has an integrating-type analogue-to-digital convertor (Cl) for deriving a digital output from the said voltage signal, comprising means arranged and connected for adjusting the integrating time of the convertor, when the scale is loaded with a preselected known weight, to bring the said digital output towards a desired value corresponding to the said preselected known weight.
Claim 2
Dependent Claim
79 words
Span setting circuitry, for an electronic scale which provides a voltage signal proportional to the weight of an item being weighed thereby and has an integrating-type analogue-to-digital convertor (Cl) for deriving a digital output from the said voltage signal, comprising means arranged and connected for adjusting the integrating time of the convertor, when the scale is loaded with a preselected known weight, to bring the said digital output towards a desired value corresponding to the said preselected known weight.
Claim 3
Independent Claim
59 words
A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) a control unit having a software-implemented timer for controlling a primary integrating time of the double-integrating A/D converter; and (b) adjusting means for adjusting an operation time of said software-implemented timer.
Claim 4
Independent Claim
59 words
A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) a control unit having a software-implemented timer for controlling a primary integrating time of the double-integrating A/D converter; and (b) adjusting means for adjusting an operation time of said software-implemented timer.
Claim 5
Independent Claim
71 words
A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) display means for displaying a digital signal produced by the A/D converter; (b) a control unit having a software-implemented timer for controlling a primary integrating time of the A/D converter; and (c) adjusting means for adjusting an operation time of said software-implemented timer.
Claim 6
Independent Claim
71 words
A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) display means for displaying a digital signal produced by the A/D converter; (b) a control unit having a software-implemented timer for controlling a primary integrating time of the A/D converter; and (c) adjusting means for adjusting an operation time of said software-implemented timer.
Claim 7
Dependent Claim
27 words
A system according to claim 2 or 3, wherein said adjusting means comprises input means for entering said operation time as an input to said control unit.
Claim 8
Independent Claim
87 words
A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) the double-integrating A/D converter having a control unit with a software-implemented timer for controlling an integrating time to integrate the weight signal; (b) setting means for applying a signal to change an operation time of said software-implemented timer in steps to said control unit; and (c) a variable resistor for continuously adjusting a reference voltage of said A/D converter.
Claim 9
Independent Claim
87 words
A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) the double-integrating A/D converter having a control unit with a software-implemented timer for controlling an integrating time to integrate the weight signal; (b) setting means for applying a signal to change an operation time of said software-implemented timer in steps to said control unit; and (c) a variable resistor for continuously adjusting a reference voltage of said A/D converter.
Claim 10
Dependent Claim
94 words
6 . A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) the double-integrating A/D converter having a control unit with a software-implemented timer for controlling an integrating time to integrate the weight signal; (b) setting means for applying a signal to change an operation time of said software-implemented timer in steps to said control unit; and (c) a variable resistor for continuously adjusting an input voltage applied as the weight signal to said A/D converter.
Claim 11
Dependent Claim
94 words
6 . A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) the double-integrating A/D converter having a control unit with a software-implemented timer for controlling an integrating time to integrate the weight signal; (b) setting means for applying a signal to change an operation time of said software-implemented timer in steps to said control unit; and (c) a variable resistor for continuously adjusting an input voltage applied as the weight signal to said A/D converter.
Claim 12
Independent Claim
131 words
A system for adjusting the span of an electronic scale having a double-integrating A/ D converter for converting a weight signal into a digital signal, said system comprising: (a) a memory for storing a digital value indicative of the weight of a weighty (b) a control unit having a software-implemented timer for controlling a primary integrating time of said A/D converter and adjusting means for reading the digital value from said memory, comparing the read digital value with an output value from said A/D converter at the time a weight is placed on a scalepan of the scale, and adjusting an operation time of the software-implemented timer so that the compared values will be equal to each other; and (c) a span command switch for commanding operation of said adjusting means.
Claim 13
Independent Claim
131 words
A system for adjusting the span of an electronic scale having a double-integrating A/ D converter for converting a weight signal into a digital signal, said system comprising: (a) a memory for storing a digital value indicative of the weight of a weighty (b) a control unit having a software-implemented timer for controlling a primary integrating time of said A/D converter and adjusting means for reading the digital value from said memory, comparing the read digital value with an output value from said A/D converter at the time a weight is placed on a scalepan of the scale, and adjusting an operation time of the software-implemented timer so that the compared values will be equal to each other; and (c) a span command switch for commanding operation of said adjusting means.
Claim 14
Dependent Claim
116 words
8 . A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) the double-integrating A/D converter having a software-implemented timer for controlling an integrating time to integrate an input signal and a control unit having control means for controlling an operation time of said software-implemented timer; (b) a memory for storing operation times of the software-implemented timer corresponding respectively to gravitational accelerations so that the span of the electronic scale remains constant for the gravitational accelerations; and (c) area indicating means for indicating areas corresponding to the operation times stored in the memory for the respective gravitational accelerations.
Claim 15
Dependent Claim
116 words
8 . A system for adjusting the span of an electronic scale having a double-integrating A/D converter for converting a weight signal into a digital signal, said system comprising: (a) the double-integrating A/D converter having a software-implemented timer for controlling an integrating time to integrate an input signal and a control unit having control means for controlling an operation time of said software-implemented timer; (b) a memory for storing operation times of the software-implemented timer corresponding respectively to gravitational accelerations so that the span of the electronic scale remains constant for the gravitational accelerations; and (c) area indicating means for indicating areas corresponding to the operation times stored in the memory for the respective gravitational accelerations.
Claim 16
Dependent Claim
40 words
A system according to claim 8, wherein the operation times stored in said memory are deviations of the operation times of said software-implemented timer for the respective areas from the operation time of said software-implemented timer for a particular area.
Claim 17
Dependent Claim
63 words
A system according to claim 9, wherein a deviation time for an indicated area is added to or subtracted from the operation time of the software-implemented timer for the particular area, and the operation time of the software-implemented timer for the indicated area is controlled by the time to which the deviation time is added or from which the deviation time is subtracted.
Claim 18
Independent Claim
98 words
A method of adjusting the span of an electronic scale which provides a voltage signal proportional to the weight of an item being weighed thereby and which has an integrating-type analogue-to-digital convertor for deriving a digital output from the said voltage signal, wherein the integrating time of the converter is adjusted, when the scale is loaded with a preselected known weight, to bring the said digital output coarsely towards a desired value corresponding to the said preselected known weight, whereafter the said voltage signal is finely adjusted to bring the said digital output closer to the desired value.
Claim 19
Independent Claim
98 words
A method of adjusting the span of an electronic scale which provides a voltage signal proportional to the weight of an item being weighed thereby and which has an integrating-type analogue-to-digital convertor for deriving a digital output from the said voltage signal, wherein the integrating time of the converter is adjusted, when the scale is loaded with a preselected known weight, to bring the said digital output coarsely towards a desired value corresponding to the said preselected known weight, whereafter the said voltage signal is finely adjusted to bring the said digital output closer to the desired value.
References Cited (Backward Citations)
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