Patent ID: 7019224

Claim:
A powder-weighing apparatus for weighing powder within a predetermined allowable range of a target weight Wt, the apparatus comprising: a powder-charging device for continuously charging a powder; a primary-charge weighing portion having weighing means for weighing while the powder is being charged from the powder-charging device and retaining a weight W 1 of primary-charge powder within the predetermined allowable range of the target weight Wt; and one auxiliary-charge weighing portion having weighing means for weighing while the powder is being charged from the powder-charging device and retaining a weight W 2 of auxiliary-charge powder within a predetermined range of an auxiliary-charge weight Ws, wherein when the weight W 1 of the powder retained in the primary-charge weighing portion is within the predetermined allowable range of the target weight Wt, the powder retained only in the primary-charge weighing portion is discharged, and when the weight W 1 of the powder retained in the primary-charge weighing portion is less than a lower limit of the predetermined allowable range of the target weight Wt, the powder retained in the primary-charge weighing portion and the auxiliary-charge weighing portion is discharged.