Arrangement for unloading and loading of x-ray film cassettes

An arrangement for unloading and loading of X-ray sheet film cassettes which have flat sides with standarized but different sizes and which also can be used for receiving different sheet film sorts and reloadable with respective sheet film sorts, the arrangement comprising a light-tight closable shaft for receiving a cassette;

• transporting means for inserting and withdrawing of the cassettes;
• means for positioning the cassette so that one corner of cassettes of different types is positioned at the same location;
• a mechanically-electronic comparison device for determining a format of a cassette;
• a device for opening the cassette;
• means for.withdrawing a film and inserting of a new film into the cassette;
• and means for automatically distinguishing cassette types with the same sizes or size regions and loadable with different film sorts, said automatically distinguishing means including at least one outwardly sensible marking provided on the cassettes of at least one type, at least one sensor arranged to sense the marking with a positioned cassette, and a comparison device which is connected with said sensor for automatic selection of a sheet film size or sort for further loading.