Weighing scales – Computer – Electrical
Patent
1987-08-25
1989-07-11
Miller, George H.
Weighing scales
Computer
Electrical
177 50, G01G 1300, G01G 1952
Patent
active
048462918
DESCRIPTION:
BRIEF SUMMARY
[TECHNICAL FIELD]
The present invention relates to a combination weighing apparatus which divides an aggregate (object to be weighed) of a large number of products whose weights individually vary, such as foodstuffs, into a plurality of product groups each having a partial weight as a part of a desired final target weight or a weight closest thereto, and combines the partial weights of these product groups to obtain a product set having the desired final target weight or a weight close thereto.
[PRIOR ART]
A combination weighing apparatus of this type is known. For example, U.S. Pat. Nos. 4,344,492 and 4,385,671 and British Patent No. 77067B have been proposed.
When, in a combination weighing apparatus of this type, a plurality of product groups each having a partial weight are appropriately combined to obtain a product set having a final target weight, as the number of groups to be combined becomes larger, the combined total weight can coincide with or be closely closest to a desired final target weight. More specifically, the combined total weight can coincide with or be close to the final target weight with high precision.
FIGS. 1 to 3 show a conventional combination weighing apparatus. The basic operation of the apparatus will be described, and various problems of the conventional weighing apparatus of this type will be explained.
First, the operation will be described with reference to FIG. 1, which shows the entire schematic structure.
In the combination weighing apparatus shown in FIG. 1, objects to be weighed, such as foodstuffs, fed from a plurality of feeders 1-1 to 1-n to intermediate hoppers 2-1 to 2-n, are stored in pairs of weighing hoppers 4-1 to 4-2n arranged therebelow when discharge gates 3-1 to 3-2n, which are arranged at both sides of each of intermediate hoppers 2-1 to 2-n, are opened.
Weighs 10-1 to 10-n are respectively arranged for each pair of a plurality of weighing hoppers 4-1 to 4-2n. The weight of the object to be weighed in either of two weighing hoppers, e.g., in hoppers 4-1 and 4-2, is calculated by controller 11, based on a weighing value supplied by meter 10-1.
More specifically, the number of partial weights that can enter a combination for obtaining a final target weight (preset weight) can be a maximum of twice that of meters 10-1 to 10-n.
Weighing hoppers 4-1 to 4-n are arranged as shown in FIGS. 2 and 3 in order to detect the weights of objects to be weighed in a pair of weighing hoppers. FIG. 3 is a sectional view taken along a line I - I' in FIG. 2. For the sake of simplicity, only one pair of weighing hoppers will be explained below.
More speifically, a pair of weighing hoppers 4-1 and 4-2 each have a pentagonal section. The weighing hoppers respectively have openings 5-1 and 5-2 on the upper surface side. One inclined portion of the lower portion of each weighing hopper is openable/closable in the direction indicated by arrow 100 in FIG. 3 by discharge gate 6-1 or 6-2. The weighing hoppers are coupled so that the outer surfaces of walls 8-1 and 8-2, continuous with the other inclined portions 7-1 and 7-2, are in contact with each other. The coupled pair of weighing hoppers 4-1 and 4-2 are detachably supported on meter 10-1 by support member 9-1.
Therefore, controller 11 stores, in a memory (not shown), a weighing value in an empty state wherein no object to be weighed is stored in weighing hoppers 4-1 and 4-2, i.e., a total of self weights of weighing hoppers 4-1 and 4-2 and a self weight of support member 9-1, and the like (to be referred to as a zero-point correction value hereinafter). The weighing value in the empty state is subtracted from a weighing value obtained when an object to be weighed is stored in one weighing hopper 4-1, thereby calculating the weight (corresponding to the partial weight described above) of the object to be weighed stored in one weighing hopper 4-1. A total consisting of the weighing value in the empty state and the weight of the object to be weighed is subtracted from the weighing value when an object to be weighed is stored in
REFERENCES:
patent: 4344492 (1982-08-01), Hirano
patent: 4385671 (1983-05-01), Hirano
patent: 4465149 (1984-08-01), Kawashima et al.
patent: 4616722 (1986-10-01), Moran
patent: 4625817 (1986-12-01), Kawashima et al.
patent: 4658920 (1987-04-01), Matsumoto et al.
patent: 4661917 (1987-04-01), Haze et al.
patent: 4666002 (1987-05-01), Haze
Osawa Masao
Tanaka Noboru
Tomiyama Sadayoshi
Tsukasa Fumihiro
Anritsu Corporation
Miller George H.
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