Weighing scales – Processes
Patent
1982-04-28
1988-04-26
Hartary, Joseph W.
Weighing scales
Processes
177 25, 364567, G01G 1942, G01G 1922
Patent
active
047398469
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of counting articles with increased accuracy in combinatorial counting of articles which have variations in the weight of a single article (hereinafter referred to as unit weight), such as packaged cups of bolts, nuts, and milk.
In the case of combinatorial counting which comprises the steps of weighing groups of articles respectively by a plurality of weighing machines, converting the weight measured by each weighing machine into the number of articles in each group, and performing combinatorial calculations of the individual weights to obtain a predetermined number of articles, said conversion of weights into numbers is performed by dividing each measured weight by the unit weight, or the weight of a single article. However, if there is an error in the unit weight, this results in an error in the number of articles calculated for each weighing machine and hence an error in the combination number obtained by performing combinatorial calculations, thus making accurate counting impossible. Further, the greater the number of articles weighed by a single weighing machine, the greater the error in the calculated number. Therefore, in order to calculate the number of articles accurately, it is necessary to find the unit weight accurately. However, since articles vary in the unit weight, as described above, it would be nonsense to weigh a single article accurately for the purpose of finding the unit weight. Thus, it would be better to find the unit weight by weighing a number of articles and dividing their weight by the number of articles; the greater the number of articles to be weighed, the more accurately can the unit weight be ontained. Therefore, it is preferable that the value for the unit weight of articles which is determined by suitable means at the start of weighing operation be replaced by a new value obtained by calculation in each weighing operation. In order to find the unit weight more accurately, there is a method of renewing the unit weight for each weighing operation, which comprises the steps of initially charging each weighing machine with a lesser number of articles and gradually increasing the number of articles to be charged into each weighing machine in successive weighing operations until it corresponds to the number of articles to be obtained. Further, where combinatorial counting is repeated, there are cases where the unit weight of articles gradually decreases (or increases) as a whole with the lapse of time. This occurs, e.g., when milk is charged into cups, because the viscosity of milk varies with ambient temperature. In this case also, it is necessary to calculate the unit weight of articles for renewal in each weighing operation.
Accordingly, it is an object of the present invention to provide more accurate combinatorial counting by calculating the unit weight from the weight or weights of articles weighed by a single or a plurality of weighing machines in each combinatorial operation, to renew the value for the unit weight so as to obtain a more accurate value for the unit weight.
According to the invention, since the unit weight for calculating the number of articles from their weight can be obtained from the weight of a number of articles which is actually calculated, the counting accuracy can be increased. According to the invention, even if the unit weight of articles gradually varies during counting, such variations can be automatically accommodated by renewing the unit weight of articles in each counting operation, so that very accurate counting can be effected. Further, according to the invention, since the unit weight is automatically renewed by weighed articles themselves through combinatorial weighing, the initial setting of unit weight can be very accurately effected, even in the case of weighing a large number of articles, by initially weighing a relatively small number of articles and then gradually increasing the number of articles to be weighed.
A combinatorial counting method has heretofore been known, comprising the step
REFERENCES:
patent: 4157738 (1979-06-01), Nishiguchi
patent: 4313507 (1982-02-01), Hays
patent: 4336853 (1982-06-01), Hirano
patent: 4344492 (1982-08-01), Hirano
patent: 4360070 (1982-11-01), Hirano
Asai Yoshiharu
Minamida Kazukiyo
Hartary Joseph W.
Kabushiki Kaisha Ishida Koki Seisakusho
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