Combination weighing device

A combination weighing device, comprising a plurality of weighing balances for weighing a plurality of articles each to produce corresponding weight signals, respectively, an adder circuit for summing up incoming signals to produce a sum signal, means for coupling said weight signals to said adder circuit through individual normally-open switches each having a control input, means coupled to said control inputs for closing said switches selectively in accordance with a predetermined set of combinations thereof, first means for providing predetermined first upper and lower limits of an allowable range of the total weight of articles, means for comparing said sum signal with an incoming allowable range to produce a command signal when the sum falls within said range, and means responsive to said command signal for storing a current combination for utilization, second means for providing predetermined second upper and lower limits of an allowable range of the unit weight of said articles, means for providing a predetermined total number of articles, multiplier means for multiplying said second upper and lower limits by said total number to produce third upper and lower limits, respectively, means for comparing said first and third upper and lower limits with each other and applying the severe ones of said upper and lower limits to said command signal producing and comparing means as the upper and lower limits of said allowable range.