Positioning device for a sample carrier

An apparatus for positioning a sample carrier plate, wherein the apparatus comprises:

• a main body for receiving the sample carrier plate;
• positioning stops, which are disposed in diagonally opposing first corner regions of the main body and are prestressed for clamping the sample carrier plate and mounted displaceably;
• an actuating device which is disposed at the main body and is adapted such that by actuating the actuating device, the positioning stops can be transferred between an operating state engaging the sample carrier plate and an operating state releasing the sample carrier plate;
• a force transmitting element which is adapted to transmit an actuating force from the actuating device to the positioning stops;
• wherein the force transmitting element comprises a rotatably mounted coupling disk,
• wherein the rotatably mounted coupling disk is coupled to the actuating device and the positioning stops,
• first coupling rods, each of which is coupled to the respective positioning stop and to the rotatably mounted coupling disk,
• wherein the first coupling rods are coupled in an articulated manner to the rotatably mounted coupling disk,
• a second coupling rod by which the actuating device is coupled to the rotatably mounted coupling disk;
• wherein the second coupling rod is connected in an articulated manner to the rotatably mounted coupling disk and is connected in an articulated manner to the actuating device.