device for collection analysis, especially in the automatic echantillonneurs

摘要

The invention concerns a device for picking up liquid samples to be analyzed, especially in automatic samplers, said device comprising a needle connected to a sucking pump and supported by a support which moves said needle downwards to pick up the sample from a vial containing same and upwards from said vial. In order to perform a washing step after one aspiration and before the subsequent one, the needle support is designed to perform an oscillating movement when the support is in its upward position with respect to the vial. The oscillating movement is performed by the cooperation of cam means and a control rod having at least a pivot axis controlling the alternative movements. The oscillating movement makes the needle plunge into a sidewardly positioned trough containing a washing liquid.