Patent ID: 6488207
Filing Date: 2002-12-03
Classification: G01G,G06Q

Abstract:
A bar code reader comprising:a bar code processing unit for generating a bright/dark pattern containing a plurality of bright areas and a plurality of dark areas forming a bar code by optically scanning a bar code forming surface of an object, converting the bright/dark pattern into plural categories of module values indicating widths of the respective bright areas and widths of the respective dark areas, and demodulating the bar code into character data; a scaling unit for creating scale data by scaling a weight of the object; a zero-adjustment control unit for working a weight scaling function of said scaling unit to perform zero-setting; and a weight change judging unit for judging at least one of an increment change from zero weight when the object is placed onto the scaling unit following the zero-setting and a decrement change from zero weight when the object is taken off the scaling unit following the zero-setting on the basis of the scale data created by said scaling unit, and outputting a corresponding piece of scale data when in the increment change and an absolute value of a corresponding piece of scale data when in the decrement change; and a comparison unit for comparing a weight of an object at a first point of time with a weight of the object at a second point of time posterior to the first point of time; wherein, if a first object having a first weight and a second object having a different second weight are on the scaling unit and the first object is removed, then the first weight is outputted; and whereby, an operator of the scaling unit does not need to re-execute a zero-adjustment after temporarily removing an object.