Powder supplying device utilizing an ultrasonic motor

Details Powder supplying device utilizing an ultrasonic motor Powder supplying device utilizing an ultrasonic motor

1997-08-08

1999-05-25

Huson, Gregory L.

Dispensing

Automatic control

Constant weight, volume or pressure control by output

222 63, 222200, B67D 508

Patent

active

059062940

ABSTRACT:
Noise caused by a mechanical vibration with a vibrator feeder is reduced in a small flow rate powder supplying device. An adverse effect caused by the noise is reduced and a flow rate accuracy is increased. Its responding characteristic is made fast. A powder hopper, a ultrasonic motor, supplying pipes and tube are supported by a supporting member held by a weighing device provided with a weight sensor. A weight signal of a weight sensor is amplified by an amplifier provided with a low pass filter. It is sampled with an A/D converter and converted into a digital value. A flow rate of powder is calculated by a CPU, a motor driving part is controlled and an amplitude of the ultrasonic motor is adjusted in such a way that a flow rate of the powder may become a target value.

REFERENCES:
patent: 4741460 (1988-05-01), Blain et al.
patent: 4945957 (1990-08-01), Kardux et al.

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