Patent ID: 6968749

Claim:
A portable automated pipette. comprising: a linear actuator including a step motor with a rotor; a flywheel including a central shaft hole for receiving the rotor, and a plurality of apertures being formed around the central shaft hole on an internal surface of the flywheel; an optical coupler arranged on two opposite sides of the flywheel, for detecting pulse signals sent from the apertures; a control circuit respectively connected to the linear actuator and the optical coupler, for receiving the pulse signals from the optical coupler, comparing the received pulse signals with predetermined pulse signals, and driving the step motor to offset the detected pulse signals when there is deviation between the detected pulse signals and the predetermined pulse signals; and an adjusting device including a tappet and a tappet socket for fitting the tappet, a lower end of the tappet being attached to a pad, and an adjusting ring being further attached on the pad.