Patent ID: 8557181

Claim:
An automatic analyzing device comprising: a sample cell having a sample cell top and sample cell bottom; a sample cell conveying part configured to convey the sample cell; a sample injecting part configured to inject a sample into the sample cell; a reagent injecting part configured to inject a reagent into the sample cell to fill the sample cell to a reagent solution weight; a measurement part configured to perform optical measurement on the solution in the sample cell by irradiating the solution with light; a stirring part configured to stir a solution in the sample cell, the stirring part includes: a stirring rod to be inserted into the solution in the sample cell and having a stirring rod lower end; a rotation motor configured to drive the stirring rod to rotate; and a vertical motor configured to move the stirring rod up and down; and; a control part configured to: (a) accelerate a rotational speed of the rotation motor of the stirring rod from rest to a high-speed, stable rotation during a downward movement of the stirring rod by the vertical motor during a first time period from a retracted position into a fixed position in the sample solution adjacent the bottom of the sample cell, (b) maintain the stirring rod in the fixed position in the sample solution at the high speed stable rotation for a second finite time period; (c) move the stirring rod to move upward by the vertical motor from the fixed position to an intermediate position in which the stirring rod lower end is above the fixed position and below the reagent solution height and maintain the stirring rod at the intermediate position for a third, finite time period at the high-speed stable rotation; (d) move the stirring rod downward from the intermediate position to the fixed position for a fourth time period while maintaining the high-speed stable rotation by the rotation motor, (e) move the stirring rod upward by the vertical motor from the fixed position to the retracted position outside the sample solution; and (f) decelerate the rotational speed of the stirring rod by the rotation motor from the high-speed stable rotation to rest whereby the stirring rod is not stopped completely until after the lower end of the stirring rod has been removed from the sample solution.