Weighing scales – Computer – Electrical
Patent
1985-10-04
1987-02-24
Miller, Jr., George H.
Weighing scales
Computer
Electrical
177 1, G01G 1922
Patent
active
046450190
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a weighing method of a high precision to select a combination of goods equal or approximately equal in total weight to the set value among a number of goods having variations in the unit weight.
Conventionally, objects to be weighed and having variations in the unit weight are placed one by one on a scale pan, and when the measured weight approaches the set weight, the last one is placed to finish the weighing. Such method, however, is defective in that a larger error will be produced when the unit weight is larger in dispersion and an average unit weight is larger, because, for example, in a case that the unit weight of weighed goods is dispersed in a range of 20 to 45 g and a measured weight of the weighed goods is 195 g with respect to the set weight value of 200 g, if a good of a 45 g unit weight is sequentially added, a total weight becomes 240 g, resulting in an excess of 40 g weight at the finish of weighing.
In the light of the above defect, this invention has been designed and directed to an accurate weighing such that a number of weighing machines weigh goods at every small amount and all the measured weights are combinational-added so that a combination of combined weight equal to or nearest the set weight is obtained, thereby discharging the weighed goods corresponding to the obtained combination from the weighing machines.
The present invention, in a case that a proper number of goods are taken out of a large number of goods to be weighed so as to be weighed and discharged by an amount of the set weight, enables the weighing of an extremely high accuracy even when the weighed goods are larger in the unit weight and in dispersion, or relatively smaller in the set weight in comparison with the unit weight.
Also, this invention relates to a counting method for goods, such as bolts or nuts, having somewhat variations in weight, and more particularly to a method for counting a total weight of a number of weighed goods, the total weight being divided by the unit weight of each good to obtain the number of the goods. An object of the invention is to provide a counting method such that a plurality of weighing machines each weigh a plurality of goods in a small number at a time to obtain the number of goods by the above division, the obtained numbers being properly combined so that the predetermined number of counted goods can be discharged with accuracy.
Conventionally, a counting method, when one kind of counted goods are bagged in a given number, discharges the goods separately one by one from, for example a part feeder and detects the passing goods one by one by use of a photo-senser, thereby counting the number of the discharged goods. In other words, a counter counts pulse generated from the detector every time one good passes and a comparator decides whether the goods reach the number set by a digital switch or the like, so that, for example, if the set number is one hundred, a signal output from the comparator stops the part feeder when the counter counts one hundred pieces, thereby carrying out bagging work. Such conventional method is suitable if the counted goods easily move separately one by one and are simple in shape, but is inadequate for goods, such as springs or eye-bolts, because the springs are apt to twist together and two may be counted as one, or one eye-bolt because of its shape may be counted as two.
In order to eliminate the above defect, this invention has been designed to provide an improved counting method. In detail, the counting method, which weighs in total an unknown number of the same kind of goods to be counted so that the total number is divided by a unit weight of the respective goods to thereby obtain the number thereof, is applied to count a small number of goods at a time by use of n sets of weighing machines, thereby combinational-adding entirely the number of goods at every weighing machine to obtain the combination of the number coincident with the desired number of goods and discharging the counted goods at weighing machines correspon
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Asai Yoshiharu
Minamida Kazukiyo
Kabushiki Kaisha Ishida Koki Seisakusho
Miller Jr. George H.
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