Weighing scales – Processes
Patent
1982-04-16
1984-08-14
Hartary, Joseph W.
Weighing scales
Processes
177 25, 177165, G01D 1932
Patent
active
044651490
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of automatically making zero adjustment of weighing machines in a combinatorial weighing or counting system without stopping the operation of the system.
Combinatorial weighing or counting comprises weighing batches of articles by n weighing machines, computing combinations of the weight values of the batches of articles or combinations of the numbers of articles, converted from the weight values by dividing the weight value of each batch by the unit weight of articles, selecting a combination which is equal or the nearest to a set weight or set number, and discharging articles according to said selected combination. Conventionally, in such combinatorial weighing or counting system, when it is desired to make zero adjustment of the weighing machines, it is necessary to interrupt weighing or counting by stopping the system to allow zero adjustment to be made with each weighing machine being emptied. Thus, normally, it has been necessary that zero adjustment be made when the power is ON at the start of operation and thereafter at predetermined time intervals by manually stopping the system. With such method, however, it is necessary to stop the system at each adjustment, resulting in low efficiency of weighing or counting operation, and it is very troublesome to make zero adjustment at predetermined time intervals. Further, if the operator forgets to make zero adjustment, the zero point in each weighing machine will deviate during use and in this condition the weighing or counting operation is continued, resulting in erroneous weighing or counting.
With the above in mind, the present invention provides an improved method of making automatic zero adjustment of one of the weighing machines selected for a combination each time a combinatorial weighing or counting operation is performed.
More particularly, the invention provides a method of zero adjustment for use with a combinatorial weighing or counting method which comprises weighing batches of articles by a plurality of weighing machines, computing combinations of the respective weight values of the batches of articles in the individual weighing machines or combinations of the respective numbers of articles, converted from said weight values, in the batches, selecting a combination of weights or numbers which is equal or the nearest to a set value, and discharging articles from the weighing machins corresponding to the selected combination, said zero adjustment method being characterized in that each time articles are discharged, that one of the weighing machines corresponding to a selected combination which is the highest in the number of times of discharge which have effected since it was zero-adjusted last or in the amount of time which has elasped since it was zero-adjusted last, and zero adjustment is made of said selected empty weighing machine.
According to the present invention, since one of the weighing machines selected for a combination is selected at each time of weighing or counting and the selected weighing machine is automatically zero-adjusted during weighing or counting operation, the trouble of stopping the system and manually making zero adjustment each time, as in the past, is eliminated, thus facilitating the operation of the combinatorial weighing or counting system. Further, since zero adjustment is made at each time of weighing or counting, there is no possibility of forgetting to make zero adjustment or of the zero point deviating, so that accurate weighing or counting is ensured.
The above and other objects and features of the present invention will become more apparent from the following description given with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of a system to which the invention is applied, showing an embodiment of the invention adapted to make zero adjustment of a weighing machine which is the highest in the number of times of discharge which have been effected since it was zero-adjusted last;
FIG. 2 is a flowchart showing a processing procedure in the sys
REFERENCES:
patent: 3939928 (1976-02-01), Murakami
patent: 4344492 (1982-08-01), Hirano
Kawashima Kazuo
Minamida Kazukiyo
Hartary Joseph W.
Kabushiki Kaisha Ishida Koki Seisakusho
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