Combination weighing device selecting desired weight and number of articles
AssigneeYamato Scale Company, Limited
InventorTakashi Hirano
Life of this patent
Estimating the term…
Abstract
A combination weighing device, which is typically used for packing a plurality of solid articles in each bag or the like, including a plurality of weighing balances for weighing a plurality of articles each at the same time, and arithmetic means for selecting some of these weighing balances so that the total weight of the articles thereon falls within a predetermined allowable range, the device also including means for checking the number of these selected articles to make them fall within a predetermined allowable range, and collecting these articles in a pack or bag so that each pack is substantially constant in weight and contains a substantially constant number of articles.
Claims2
A combination weighing device, comprising a plurality of weighing balances for weighing a plurality of articles to produce electric signals indicative of the respective measured weights, a first adder circuit for summing up the incoming signals to produce a first sum signal, first normally-open switches having a control input each for coupling therethrough the weight signals from said weighing balances respectively to said adder circuit, means for comparing said first sum signal with a predetermined allowance of weight to produce a first command signal when the sum satisfies said allowance, switch control means for providing a predetermined set of combinations of control signals applied to the control inputs of said first switches respectively to close them in accordance with said combinations in turn, and means responsive to said first command signal for storing a current combination of said control signals for utilization, a plurality of detection units associated with said weighing balances respectively for detecting the number of articles on said balances to produce electric signals indicative of the respective detected numbers, a second adder circuit for summing up the incoming signals to produce a second sum signal, second normally-open switches having control inputs coupled respectively to the corresponding outputs of said switch control means for coupling therethrough the number signals from said detection units respectively to said second adder circuit, means for comparing said second sum signal with a predetermined allowable number to produce a second command signal when the sum satisfies said allowance, and means for causing said storing means to be responsive only to presence of both of said first and second command signals.
Dependencies are inferred from the claim text.