Digital display for weighing scales
OwnerHerbert W. Ferrellinventor
Life of this patent
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Abstract
System for providing a digital indication of the load on a scale, utilizing a relative position transducer to produce two output signals which vary between fixed levels in response to incremental displacements of the output indicator of the scale. The two signals are phase encoded in that one of the signals leads the other, depending upon the direction of displacement. The two signals are processed to determine the occurrence and direction of each increment of displacement, and the count in a digital counter is incremented or decremented in response to each increment according to the direction of the displacement.
Claims1
In apparatus for providing a digital signal indicative of the load on a scale having a member operatively connected to the member for providing first and second electrical signals which change from a first level to a second level and return to the first level each time the member moves a predetermined amount, the first signal leading the second signal when the member moves in a first direction and the second signal leading the first signal when the member moves in a second direction, a first pair of cascaded flip-flops to which the first signal is applied, a second pair of cascaded flip-flops, a first exclusive OR gate connected to the outputs of the flip-flops in the first pair, a second exclusive OR gate connected to the outputs of the flip-flops in the second pair, up/down counting means, and multiplexing means responsive to the outputs of the flip-flops for delivering pulses from the OR gates to the counting means to be counted in a direction corresponding to the direction in which the displaced member moves.
Dependencies are inferred from the claim text.