Weighing scales – Computer – Electrical
Patent
1982-04-13
1983-12-20
Miller, Jr., George H.
Weighing scales
Computer
Electrical
177121, G01G 1922, G01G 1304
Patent
active
044211856
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a combinatorial weighing system for weighing objects which are liable to tangle each other, and particularly, agricultural products which are liable to tangle each other, hardly slippery, and highly elastic, such as immature green peas.
Generally, in mass weighing and corrective weighing, what is regarded as of utmost importance to increase accuracy of weighing is orderly arrangement of objects and uniformity of the density of flow of objects in a constant quantity take-out device which feeds a weighing hopper with objects of weighing. This is because the weight of objects which are put in for correction after the first stage weighing determines accuracy of weighing. In a conventional weighing machine, in the case of objects whose shape is not fit for orderly arrangement and which differ in size and weight from each other, it has been difficult to take out objects in constant amounts during corrective weighing, with little possibility of obtaining high accuracy. The present applicant has already proposed a combinatorial weighing system which enables the weighing of such objects with high accuracy. If this combinatorial weighing system is composed of ten automatic weighing machines, the amount of objects which can be fed to each automatic weighing machine by the constant quantity take-out device is 1/3-1/7 of the target combination weight; this allowable range of value, as compared with that for the conventional weighing system, is very wide. Even if these combinatorial weighing systems are used, however, it is difficult to combinatorially weigh with high accuracy a particular agricultural product which is liable to tangle each other, hardly slippery, and highly elastic, such as immature green peas (such agricultural product being hereinafter referred to as immature green peas). This is because, with the conventional constant quantity take-out device using an electromagnetic feeder, even if time control and amplitude control are effected, immature green peas absorb vibration, so that it is difficult to take out immature green peas in constant amounts without deviating from said weight range and feed them to individual automatic weighing machines.
The present invention is intended to solve the above described problem encountered when immature green peas must be fed in constant amounts to the automatic weighing machines of the combinatorial weighing system.
To this end, the invention provides a combinatorial weighing system, comprising a plurality of weighing mechanisms each comprising a feed hopper, a swing plate installed substantially in the middle of said hopper and adapted to swing in a vertical plane, opposed conveyors dispposed with their adjoining ends positioned below substantially the middle of the bottom of the feed hopper and with their delivery ends positioned outwardly of the lower ends of the lateral walls of said feed hopper, and automatic weighing machines opposed to each other and positioned below the delivery ends of the conveyors, wherein combinations of the weight values of objects weighed by the automatic weighing machines included in the individual weighing mechanisms are computed to provide a combination of weight values which is equal or the nearest to a predetermined weight.
According to the invention, objects of weighing are distributed in the bottom of the feed hopper with a uniform density without localized gathering by the vertical swing movement of the swing plate, and then taken out of the feed hopper within an allowable weight range by each conveyor into the associated automatic weighing machine. Thus, objects of weighing which are liable to tangle each other, hardly slippery, and highly elastic, such as immature green peas, can be combinatorially weighed continuously and with high accuracy.
According to an embodiment of the invention, a combinatorial weighing system composed of a number of weighing machines arranged in two opposed rows comprises weighing mechanisms each comprising a swing plate which is attached substantially centrally to the
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patent: 3939928 (1976-02-01), Murakami et al.
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patent: 4313507 (1982-02-01), Hays
Fujitani Yugo
Koto Toshio
Murakami Katsuhiko
Kabushiki Kaisha Ishida Koki Saisakusho
Miller Jr. George H.
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