| 摘要 |
An analyzer is disclosed having a device for removing and inserting a stopper from and into the opening of a container for liquids arranged in a tray, particularly test tubes filled with body fluids, a gripper which performs rotary movements frictionally interacting with stopper and a lifting means feeding the container to the gripper and fixing it. The gripper features three radially arranged clamping elements with rollers on an inner carrier member, said clamping elements being radially movable by control elements associated therewith and mounted on an outer hollow-cylindrical housing portion. The control elements are coaxially arranged in the form of a ring and each consists of a cam section having a small radius and a cam section having a larger radius, said sections being interconnected via a ramp and having a threshold.
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