Analyzing the Service Level of Software Debugging System through Simulation-based Queuing Approach

Apparatus for removing exposed sheets of X-ray film from and for thereupon introducing unexposed sheets into cassettes of the type having two pivotally connected sections and a locking mechanism for the sections has a housing with a cylindrical chamber which communicates with an opening for insertion or withdrawal of locked cassettes. A drum-shaped carrier is sealingly received in the chamber and is rotatable between a first position in which the open end of a diametrically extending compartment therein registers with the opening of the housing to allow for insertion or removal of a cassette. A cassette which is introduced into the compartment is automatically unlocked and opened during movement of the carrier to a second angular position in which the exposed sheet leaves the cassette by gravity and the cassette remains open during movement of the carrier to a third position in which the cassette receives an unexposed sheet. The carrier is thereupon rotated back to the first position and the cassette is automatically closed and locked before the open end of the compartment begins to communicate with the opening.