Inserting device for vacuum apparatus

In an inserter for vacuum installations, having a two-part arm which is provided with a driving end, a single joint and an end for holding an object, and which can turn in at least one horizontal plane about a vertical main axis disposed in the area of the driving end, said inserter having at least two motors for moving the arm about the main axis and changing the angle between the parts of the arm at the joint, the improvement wherein:

• (a) the main axis is surrounded by a housing in which an outer hollow shaft is rotatably disposed, with a central shaft coaxial therewith, the outer hollow shaft being co-rotational with the drive end of the arm and with the central shaft, there being a rotatable stubshaft belonging to the joint and supporting the outer part of the arm which has the holding end;
• (b) one independently operated motor is connected with the hollow shaft and another is connected with the central shaft for respective independent rotation of these parts;
• (c) the inner part of the arm is in the form of a hermetically sealed hollow body containing a transmission mechanism that couples the central shaft to the stubshaft;
• and
• (d) the bearings of the hollow shaft and stubshaft are sealed from the inner chamber of the vacuum system by at least low-friction, preferably friction-free, sealing element;
• (e) the housing is guided for axis-parallel displacement on guiding columns parallel to the main axis and is joined hermetically through a compensator to one wall of the vacuum system.