PURPOSE: To suck liquid always at a set amount properly by turning a rotational drive source in the direction of suction by a greater angle than the rotational angle of the rotational driven source corresponding to the backlash of a transmission mechanism.
CONSTITUTION: To a pulse-motor control circuit 20, a suction-amount setting means 21 to set the suction amount of the liquid to be sucked and an idle-turn angle setting means 22 to set a greater rotational angle than the rotational angle corresponding to the backlash of a transmission mechanism are connected. When a discharge-finish-position detection signal is inputted into a pulse-motor control circuit 20 from a position detector 24, a pulse motor 5A is turned in the direction of suction by the control circuit 20 at a set angle in the idle-turn angle setting means 22 without steeping the top of a suction/dishcarge pipe 11 connected to a piston cylinder 1A into liquid.
KIMURA SHIGEYUKI
JIN SEIZOU
TSUJI YASUHIRO
WAKABAYASHI KIYOSHIGE
CHUGAI PHARMACEUTICAL CO LTD