초록 ▼

Disclosed is the powder feeder in which the duty ratio X.sub.T corresponding to the target feed amount Q.sub.T is calculated on the basis of the calibration curve obtained by the feeder calibration which is conducted before the start of powder feed, and the powder P starts to be fed according to the

Disclosed is the powder feeder in which the duty ratio X.sub.T corresponding to the target feed amount Q.sub.T is calculated on the basis of the calibration curve obtained by the feeder calibration which is conducted before the start of powder feed, and the powder P starts to be fed according to the duty ratio X.sub.T, therefore, the actual feed amount can reach to the target feed amount Q.sub.T in a short time (within the time T.sub.1) from the start of powder feed, and the powder P can be fed while controlling the actual feed amount with high accuracy, and further the powder P can be precisely fed even in case of the short time feed for several seconds.

대표청구항 ▼

[ What is claimed is:] [1.] A control apparatus for a powder feeder which comprises a vibrator having a top end which oscillates with elliptic motion when applied a driving voltage with a resonance frequency, a powder feed path attached to the top end of the vibrator, a powder storing hopper for fee

[ What is claimed is:] [1.] A control apparatus for a powder feeder which comprises a vibrator having a top end which oscillates with elliptic motion when applied a driving voltage with a resonance frequency, a powder feed path attached to the top end of the vibrator, a powder storing hopper for feeding the powder to the powder feed path, application means for applying the resonance frequency to the vibrator according to a duty ratio, and weight sensor means for detecting a weight of the powder in the powder storing hopper, the control apparatus comprising:feeder calibration means for conducting feeder calibration before the powder feeder is used;calibration curve preparing means for preparing a calibration curve based on the feeder calibration and for storing the calibration curve;duty ratio calculation means for calculating the duty ratio corresponding to a target feed amount which is preset, based on the calibration curve prepared by the calibration curve preparing means; anddrive means for starting drive of the vibrator based on the duty ratio calculated by the duty ratio calculation means until a feed amount of the powder reaches to the target feed amount.