Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1990-09-07
1993-02-02
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
G01G 314
Patent
active
051831244
ABSTRACT:
A weighing system and method having stable measurement resolution for measuring gems and other light masses. The system includes circuitry for correcting errors in the measured value of the masses due to off-center placement on the system's holding pan. The weighing system uses a plurality of transducers about the pan to measure the weight of the mass, and includes circuitry for converting the transducer signals to signals having unknown frequencies. Circuitry is also provided for determining the unknown frequencies with an approximate stable or fixed resolution, despite wide variations in the unknown frequency. In a preferred embodiment, the number of cycles on the unknown frequency is counted and counting begins and ends of the rising edges of the unknown frequency signal. The determination of which unknown frequency edge ends the counting operation is made by monitoring a known frequency counter. When a predetermined minimum number of known frequency cycles have been accumulated, the next rising edge of the unknown frequency signal terminates the counting operation. The unknown frequency is then calculated. Finally, the frequencies from each sensor are correlated for a given mass, at given locations, to arrive at an accurate weight value for the mass in spite of its potentially off-center location on the system's weighting pan.
REFERENCES:
patent: 3922670 (1975-11-01), Shaw et al.
patent: 3966002 (1976-06-01), Schneider
patent: 4051721 (1977-10-01), Williams
patent: 4191268 (1980-03-01), Miyoshi et al.
patent: 4237989 (1980-12-01), Lewis
patent: 4273204 (1981-06-01), Gillen
patent: 4366875 (1983-01-01), Dauge et al.
patent: 4405024 (1983-09-01), Fraval et al.
patent: 4405025 (1983-08-01), Yanagita et al.
patent: 4464725 (1984-08-01), Briefer
patent: 4503922 (1984-08-01), Brosh
patent: 4738324 (1988-04-01), Borchard
patent: 4814692 (1989-03-01), Baumann
patent: 4828057 (1989-05-01), Borchard
patent: 4858145 (1989-08-01), Inoue et al.
patent: 4858145 (1989-08-01), Inoue et al.
patent: 4862978 (1989-09-01), Borchard
patent: 4862979 (1989-09-01), Borchard
patent: 4869331 (1989-09-01), Borchard
patent: 4874051 (1989-10-01), Borchard
patent: 4960177 (1990-10-01), Holm-Kennedy et al.
LandOfFree
Compact self-adjusting weighing system having stable measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compact self-adjusting weighing system having stable measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact self-adjusting weighing system having stable measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2918