Cleaning time determining device for drug storage/discharge appa

Details Cleaning time determining device for drug storage/discharge appa Cleaning time determining device for drug storage/discharge appa

1997-01-24

1998-11-17

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

340679, 34081574, 1985021, 221 2, 2505594, 356240, 356432, G08B 2100

Patent

active

058382453

ABSTRACT:
A drug storage/discharge apparatus having a cleaning time determining device which can detect dirt in drug discharge paths and determine when it is necessary to clean the discharge paths. A motor control circuit controls each feeder to discharge drugs from the feeder through its discharge opening. A light-emitting diode and a phototransistor are provided opposite to each other at the discharge opening. A drug discharged from the feeder intercepts the light from the light-emitting diode, thus fluctuating the output of the phototransistor. Based on the output fluctuation, the motor control circuit can confirm that a drug has been discharged. A low-pass filter is provided to apply only a low-frequency component of the output of the phototransistor to a comparator. Such low-frequency components represent to what degree the light-emitting diode and phototransitor are soiled. If the level of the low-frequency components drops below a reference voltage, the comparator produces a voltage Vh to indicate that the drug discharge paths have been soiled.

REFERENCES:
patent: 4866425 (1989-09-01), Landmark
patent: 5295571 (1994-03-01), Van Den Bogaert et al.

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