Abstract: A machine for carrying out a process of treating small parts with a liquid treatment medium, especially for coating the small parts or for chemically deburring the small parts, has a closable container which includes a drum to receive the parts. The drum is rotatingly drivable and adjustable between an inclined axis position and a vertical axis position. The process includes filling the drum with small parts and evacuating the closed container. Filling the container with a treatment medium, with the internal pressure set to a value in excess of the steam pressure of the most liquid component of the treatment medium. Inclining the drum to its inclined axis position and rotatingly driving the drum at a low speed. Ventilating the container and setting the drum to its vertical position.

Abstract: A two-channel forked fail-safe light barrier generates shaft position information in the region of the floors for the premature opening of the doors on arrival of an elevator car and includes a cyclical dynamic self-monitoring circuit by means of which a prophylactic fault recognition is possible. The self-monitoring circuit is responsive to the arrival and standstill of the car at a floor and periodically simulates genuine operational sequences as a brief emergence of the switching vane by an optical short-circuit of the fail-safe light barrier. The simulation effects interruption of the light barrier relay power which is, however, shorter than the release time of the relays so that the relays do not release when the circuit is intact.