COMBINATION WEIGHING APPARATUS

PURPOSE:To obtain a combination of weight near a preset value even when the average stocking amount of a weighing hopper varys due to the irregularity of the supplying condition of materials to be weighed to a feeder, the fluctuation of power source or the like. CONSTITUTION:A parameter operating circuit 50 which decides a transporting force of each feeder calculates the ratio of the average stocking amount Wa/L of a weighing hopper that stocks materials to be weighed to a target weight per weighing hopper W/M and multiplies the ratio with a present parameter FN to calculate a parameter FS for coinciding the average stocking amount with W/M. A difference DELTAF between FS and FN is multiplied by a control coefficient X not less than 1 and the additional value of X.DELTAF and FN is stored into a transporting force memory device 52 as a new transporting parameter FN+1. The feeder corresponding to the unloaded weighing hopper is driven at the force in proportion to the new transporting parameter stored in the transporting force memory device 52.