ES416939A1 - Automatic pipettor - Google Patents

Abstract

Apparatus for feeding a multitude of separate amounts of samples and liquid reagents to a multi-chamber transfer disc in a rotary chemical analyzer having multiple radially coaxial chambers, each chamber having a reagent cavity and a sample cavity, characterized by containing support means that can rotate about a vertical axis and are mounted to support the transfer disc; an annular element supported on the rotating means, which has several receptacles peripherally located and adapted to receive the liquid samples destined for analysis; means for coupling the transfer disk and the annular element with the rotating means and aligning chambers of the transfer disk with the receptacles of the annular element; a drive having an axis coupled to it and intended to communicate rotary motion to the axis, this axis being located such that its axis of rotation is perpendicular to the axis of rotation of the supporting rotary means; First, second and third cam arrangements coupled to the shaft, by means of which a continuous rotary motion is communicated thereto after the drive is put into operation; a reservoir for the solvent, located in a position adjacent to the annular element; a reagent reservoir, located in a position adjacent to the annular element; a first lever element coupled for interaction with the first cam element; a first element of a sampling apparatus, this element being designed to contain a liquid and being coupled with the first lever element for its support; a second lever element coupled for interaction with the second cam element; a second element of the sampling apparatus to contain the liquid, coupled with a second lever element to support it; a control device coupled with the rotating means and with the shaft, originally aligned with a selected receptacle and with the second element of the sampling apparatus along the radius of the transfer disc; and because, in order to increase the speed and precision of the dosing supply, it contains a first electrical control means mechanically operated by the control device; a first pumping arrangement that communicates with the first sampling arrangement and that has reciprocating moving means to facilitate the reception and distribution of the liquid on the first sampling arrangement; an electrically operated stepper motor connected to the means for performing reciprocating motion of the first pump; second electrical control means mechanically actuated by the means for performing the reciprocating movement; third mechanically actuated electrical control means when the first element of the sampling apparatus is in the second rest position; fourth electrical control means mechanically actuated by the first lever element to stop the stepper motor; a fifth electric control means to stop the stepper motor; and a second pumping device communicating with the second element of the sampling apparatus, coupled for interaction with the third cam arrangement. (Machine-translation by Google Translate, not legally binding)