Electronic postage scale

Details Electronic postage scale Electronic postage scale

1977-07-18

1979-02-13

Gruber, Felix D.

Boots, shoes, and leggings

177 25, 177 50, 364466, 364571, G01G 19413, G06F 1102

Patent

active

041398920

ABSTRACT:
An improved scale, and particularly an electronic postage scale, wherein a parcel is weighed and postage is computed automatically in accordance with the weight of the parcel and the particular class of shipment and destination zone therefor. It is one feature of this scale to determine a corrected reference level against which the parcel is weighed, notwithstanding changes in this reference level over a period of time due to, for example, parameter changes, electrical "drift," a build-up of particles, such as dirt or other residue, or the like. Another feature of this scale is improved, simplified automatic calibration. The scale is provided with a keyboard which, during a calibration operation, is selectively operated so as to key-in numerical data representing a standard weight. The keyed-in data is compared to the standard weight as actually measured by the scale, and a calibration factor is generated by dividing the keyed-in data by the measured standard weight. This calibration factor then is used as a multiplier for all subsequent measured weights.
In one embodiment of the electronic postage scale, a micro-processor unit is used in conjunction with random access memories (RAM) and programmable read only memories (PROM) to perform a weighing operation, a postage calculating operation and a data display operation, in accordance with the weighed parcel and various keyboard entries.

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