| 摘要 |
PCT No. PCT/CH89/00033 Sec. 371 Date Nov. 29, 1989 Sec. 102(e) Date Nov. 29, 1989 PCT Filed Feb. 21, 1989 PCT Pub. No. WO89/10191 PCT Pub. Date Nov. 2, 1989.An automated pipetting device has a first driving motor (1) with a spindle (1') to drive a plurality of injection pistons (6) each movable by a piston shaft (7), and a second driving motor (2) that drives a carrier plate (3) with a spindle (2') in a horizontal direction. A plurality of pipette cylinders (5) are carried in the carrier plate (3) which is pressed against a stationary valve plate (4). The valve plate has a duct system (10) with channels (11,12,13) for supplying and removing liquid. Each individual pipette is spring biased so that its outlet region is pressed against the valve plate at openings of the channels and the carrier and pipettes can be moved with the pipette outlets pressed against the valve plate surface. Each pipette has independent means for applying the spring bias.
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