Pumping apparatus using a stepping motor

Details Pumping apparatus using a stepping motor Pumping apparatus using a stepping motor

1979-12-03

1982-04-27

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 22, 417 42, 417 45, 417 63, 417415, F04B 4900

Patent

active

043268374

ABSTRACT:
A precision-delivery and precision-pressure piston pump is actuated by a cam controlled by a finestep stepping motor. The initial delivery pressure is precisely regulated by fixing the commencement of the delivery stroke at the cam with the aid of the stepping motor, as well as the time required for this delivery. Delivery is also regulated very precisely, for example in a ratio of 1 to 1000 by controlling the delivery stroke with the aid of the stepping motor. The pump is of use in particular in high-pressure liquid-phase chromatography.

REFERENCES:
patent: 3471079 (1969-10-01), Myers
patent: 3966358 (1976-06-01), Heimes et al.
patent: 4137011 (1979-01-01), Rock
patent: 4180375 (1979-12-01), Magnussen
patent: 4209258 (1980-06-01), Oakes
patent: 4221543 (1980-09-01), Cosentino et al.

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