Patent ID: 8093514

Claim:
A mixing-weighing combination weigher comprising: a plurality of kind-based groups each of which is made up of a plurality of combination hoppers fed with objects to be weighed, the kind-based groups being fed with different kinds of objects to be weighed; and a control means; wherein the control means is configured to carry out: a kind-based combination process in which combination calculation is performed based on weight values of the objects to be weighed fed into the combination hoppers to find combination weight values for each of the kind-based groups, and combination weight values of a first selection number predetermined for each kind are selected from the combination weight values based on a predetermined kind-based combination selection condition; an all-kind combination process in which combination calculation is performed in such a manner that one combination weight value is selected for each kind from the combination weight values selected in the kind-based combination process, and the selected combination weight values are combined to find all-kind combination total values that are totals of combination weight values for all kinds, one all-kind combination total value is selected from the all-kind combination total values found in the combination calculation based on a predetermined all-kind combination selection condition, and combinations of the combination hoppers corresponding to the combination weight values combined to form the selected all-kind combination total value are respectively determined as kind-based discharge combinations; a discharge process for discharging the objects to be weighed from the combination hoppers making up of the kind-based discharge combinations determined in the all-kind combination process; wherein the first selection number is equal for all kinds; and wherein when a target time of a time taken for combination calculation in the all-kind combination process is T, a time taken for calculation of one set of combination in the combination calculation in the all-kind combination process is t, and the number of the kind-based groups is K, the first selection number is set to a predetermined value that is not larger than an integer value obtained by rounding a first decimal place of a value represented by (T/t) 1/k .