Pumping system

Details Pumping system Pumping system

1985-03-18

1990-10-23

Rolla, Joseph J.

Dispensing

Cutoff operated by selectively preset volume or rate of...

222 63, 222333, 417 17, 7386177, 7386418, B67D 508

Patent

active

049645331

ABSTRACT:
To control with precision and repeatability the amount of fluid dispensed or aspirated by a pumping system, a volume disk rotates with the output shaft of a DC motor that drives a reciprocating dispensing pump. A sensor detects indicia on the disk and provides periodic signals spaced-apart in time by an amount: (1) an amount proportional to the volume of fluid pumped; (2) proportional to the angle between indicia; (3) less than one-third of the length of the total stroke of the piston as the piston moves linearly in its working portion of a cycle; (4) necessary for the piston to sweep out a volume of less than five milliliters. The speed of the pump is controlled by a second disk having equally spaced indicia that are sensed to provide signals proportional to the motor speed. During dispensing or aspirating large volumes, the motor speed is increased to a high speed, run at the high speed and then decreased before stopping and during dispensing smaller volumes, it is maintained at a constant lower speed.

REFERENCES:
patent: 3743140 (1973-07-01), Sauerbrey
patent: 3887110 (1975-06-01), Porter
patent: 3985021 (1976-10-01), Achener et al.
patent: 4008003 (1977-02-01), Pinkerton
patent: 4159785 (1979-07-01), Berry, Jr.
patent: 4475666 (1984-10-01), Bilbrey et al.
patent: 4531839 (1985-07-01), Cunisse et al.
patent: 4534706 (1985-08-01), Palm et al.
IBM Technical Disclosure Bulletin, vol. 9, No. 8, Jan. 1967, p. 989.

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